SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)
 SAE 10W-30 Signature Series 100% Synthetic Motor Oil (ATM)

The Top Tier of AMSOIL Synthetic Motor Oil. AMSOIL Signature Series Synthetic Motor Oil delivers extraordinary lubrication in all types of automotive gasoline engines. Engineered for enthusiasts seeking maximum protection and performance. Precision-formulated with cutting-edge technology and a longstanding devotion to making the world's best motor oil. The result: engine protection that blows the doors off the highest industry standards.

• 50% more cleaning power vs. AMSOIL OE Motor Oil
• Ideal for turbos & direct injection
• Guaranteed protection for up to 25,000 miles or 1 year

Package sizes include:

Quart Bottle
Gallon Bottle
30-Gallon Drum
55-Gallon Drum

Product Code: ATM • Brand: AMSOIL




MSDS Data Sheet French Data Sheet

Product Details Tech Data Reviews & RatingRelated Videos

Product Applications
AMSOIL Signature Series Synthetic Motor Oil is excellent for use in all types of gasoline-fueled vehicles. It is recommended for all domestic and foreign vehicles requiring any of the listed performance specifications:

Product Application Specs

• API SN (Resource Conserving), SM
• ILSAC GF-5, GF-4
• ACEA A5/B5, A1/B1
• GM LL-A-025, 6094M, 4718M
• Ford WSS-M2C205-A
• Chrysler MS-6395

Product Description
AMSOIL Signature Series Synthetic Motor Oil delivers extraordinary lubrication in all types of automotive gasoline engines. By combining industry-premier synthetic technology with AMSOIL premium additives, Signature Series Synthetic Motor Oil exceeds the higher performance demands of modern engines. It withstands the stress of higher horsepower, higher heat and complicated emissions control systems. Signature Series Synthetic Motor Oil is engineered to outperform competitive conventional and synthetic motor oils. It delivers long-lasting performance and protection.

AMSOIL, the leader in automotive synthetic lubrication, produced the World's first API-qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL, the First in Synthetics®, to do the best job protecting your engine.

Protects Against Engine Wear
AMSOIL Signature Series Synthetic Motor Oil develops a strong fluid film that keeps metal surfaces separated while its robust anti-wear additives further reduce wear in metal-to-metal contact regions for maximum engine life. The Sequence IVA Engine Test, which must be passed to meet the industry-standard API SN specification, simulates extended periods of stop-and-go driving.

For 100 hours, the test engine cycles between 50 minutes of idling and 10 minutes of elevated rpm - conditions that encourage engine wear. The camshaft is then measured for wear in 84 locations and an average score is determined. We used Signature Series 0W-20, the lightest viscosity in the line, to further increase the severity of the test. AMSOIL Signature Series Synthetic Motor Oil provided 75 percent more engine protection against horsepower loss and wear* than required by the industry standard, extending the life of vital components like pistons and cams.

Cam Lobes Wear Test - AMSOIL SS reduces cam wear
sequence IVA engine test results
*Based on independent testing of AMSOIL Signature Series 0W-20, in ASTM D6891 as required by the API SN specification.

Protects Pistons from Low-Speed Pre-Ignition (LSPI)
We armed Signature Series with an advanced detergent system that protects against harmful deposits and low-speed pre-ignition (LSPI). Most new engines feature gasoline direct injection (GDI), often combined with a turbocharger to boost power and improve fuel economy. These new technologies, when combined with a poorly formulated motor oil, promote LSPI and threaten engine operation. LSPI is the spontaneous ignition of the fuel/air mixture prior to spark-triggered ignition. It occurs in today's advanced engines and is much more destructive than typical pre-ignition.

Original equipment manufacturers (OEMs) like GM* have addressed the issue by designing tests to determine a motor oil's ability to prevent LSPI. The GM test allows up to five LSPI events to receive a passing score. Signature Series Synthetic Motor Oil provided 100 percent protection against LSPI* - zero occurrences were recorded.

LSPI piston damage when competitors motor oil is used

Protects Turbochargers
Our unique synthetic formulation is inherently stable to resist oxidation and neutralize acids. Signature Series Motor Oil provides outstanding protection against deposits common to high-temperature engine environments. The tremendous heat and stress turbos create can cause some oils to break down and form harmful bearing deposits through a process known as turbo coking. Over time, turbos can suffer reduced performance or fail altogether.

We challenged Signature Series to the GM Turbo Coking Test, which consists of 2000 cycles of extreme heat soaks. An oil must limit the temperature change within the turbocharger to 13 percent or less to pass the test. Signature Series limited the temperature increase to only 3.6 percent, protecting the turbocharger 72 percent better than required* by the GM dexos1® Gen 2 specification.

amsoil turbo bearing shaft protection

Extends Drains: Protection Guaranteed
AMSOIL Signature Series 25,000 miles drain interval technologyAMSOIL Signature Series Synthetic Motor Oil provides reserve protection, allowing you to go longer between oil changes if you choose up to 25,000 miles, 700 hours of operation or one year, whichever comes first*. Our unique synthetic formulation and long-drain additive system are inherently stable to resist oxidation and neutralize acids over longer periods. Signature Series is designed to deliver outstanding engine protection, cleanliness and performance over extended drain intervals - guaranteed. It provides peace of mind so you can fit oil changes into your schedule.

Oil Filter:

Any brand of oil filter may be used with Signature Series Synthetic Motor Oil. For maximum convenience, however, use an AMSOIL Ea® Oil Filter. Made of fully synthetic media with greater filtering efficiency and dirt-holding capacity than conventional filters, Ea Oil Filters are recommended for 25,000 miles/12 months or 15,000 miles/12 months, depending on application, which coincides with Signature Series' once-a-year drain interval. While Signature Series' 12-month service life remains intact if a non-Ea Oil Filter is used, the filter must be changed according to its manufacturer's recommendations.

Trusted by Professional Engine Builders

Engine Masters ChallengeDedicated engine builders and mechanics put in long hours honing their craft. These architects of powerful, high-performance engines turn to Signature Series to protect their passion.

"When we use AMSOIL, I don't worry about a film breakdown or an oil breakdown - and the oil pressure is always consistent. We've tested oils back-to-back on the dyno in our shop and we're always able to make more power with AMSOIL."

-Brett Bowers, Engine Masters Competitor and Professional Engine Builder

Maximum Cleaning Power to Battle Sludge

AMSOIL Signature Series offers Maximum Cleaning Power to Battle SludgeAMSOIL Signature Series Synthetic Motor Oil has 50 percent more detergents* to help keep oil passages clean and promote oil circulation.

Engine failures due to sludge are often caused by a plugged oil pick-up tube screen - the motor is effectively starved of oil. The Sequence VG Engine Test measures an oil's ability to prevent sludge. During the test, a Ford 4.6L engine is subjected to sludge-inducing conditions for 216 hours. The industry standard allows for 10 percent blockage before the motor oil fails the test. Signature Series produced a screen virtually free from sludge (see image). Its detergent and dispersant additives are so effective, Signature Series provides 90 percent better protection against sludge.

• *Based on independent testing of AMSOIL Signature Series 5w-30 motor oil, in the LSPI engine test as required for the GM dexos 1® Gen 2 specification.
• *Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.
• *vs. AMSOIL OE Motor Oil
• *Based on independent testing of AMSOIL Signature Series 5W-30 in the ASTM D6593 engine test for oil screen plugging as required by the API SN specification.
* All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

Preserves Horsepower
The extreme durability of Signature Series Motor Oil ensures your engine runs stronger, for longer. We installed Signature Series 5W-30 Synthetic Motor Oil in a Ford* F-150 with a new 3.5L Ecoboost engine to test its ability to protect turbocharged direct-injection (TDGI) engines from torque and horsepower loss during extended drain intervals up to 25,000 miles. Power sweeps were done at the beginning and end of the test to evaluate horsepower and torque retention. As the graph shows, Signature Series helped maintain engine performance throughout the 100,000 mile test.

horsepower degradation test results

Limits Oil Consumption
Signature Series has a uniform molecular structure that limits evaporation and keeps it where it's needed most - protecting your engine. Volatility (burn-off) occurs when oil gets hot, causing lighter molecules to burn off or evaporate. This leads to oil thickening, additive imbalance, higher emissions and oil consumption. The NOACK Volatility test is the industry standard for evaluating motor oil high temperature evaporation. It measures the percentage of burn-off after a motor oil is placed under constant airflow at 482°F for 1 hour. A lower number indicates a better resistance to evaporation. Signature Series falls far below the API limit for volatility, reducing the need for frequent oil top-offs and limiting vehicle emissions.

noack volatility test results

Easier Cold-Starts
Signature Series Synthetic Motor Oil does not contain paraffins (wax) and stays fluid in temperatures of -58°F and lower. Extreme cold causes other motor oils to thicken, starving vital moving parts of lubrication, accelerating wear and even preventing vehicles from starting. Signature Series provides 66 percent better cold-temperature performance for easier starting, better fuel economy, improved oil flow (as seen below) and reduced wear.

pour point test results

Maintains Protective Viscosity
We formulated Signature Series with superior thermal durability that resists breakdown better than conventional and synthetic motor oils. The Sequence IIIH Test uses the Chrysler 3.6L Pentastar engine to evaluate a motor oil's ability to resist the damaging effects of heat. The test is conducted with oil temperatures of 304°F, 100°F hotter than normal operation, to accelerate oil thickening and deposits. Despite the extreme conditions, Signature Series kept pistons clean and held thickening to only 6 percent, a minimal amount compared to the proposed specification limit of 150 percent*. This stay-in-grade performance helps maintain maximum power and fuel economy while also ensuring advanced technologies like variable valve timing (VVT) operate as designed throughout the entire drain interval.

sequence III-H test results

• *Based on proposed ILSAC GF-5 Plus specification.
*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

SERVICE LIFE
Normal Service: Up to 25,000 miles, 700 hours of operation or one year, whichever comes first, in personal vehicles not operat-ing under severe service.

Severe Service: Up to 15,000 miles, 700 hours of operation or one year, whichever comes first. Severe service conditions include commercial or fleet vehicles; excessive idling; or frequenttowing, hauling, plowing or driving in dusty conditions.
• Modified engines (non-stock), racing vehicles and vehicles using alternative fuels (E85, CNG, propane, etc.) are excluded from extended drain interval recommendations.
• Change at the vehicle manufacturer’s recommended drain interval outside U.S. and Canada.
• AMSOIL Ea® Full-Flow Oil Filters are designed for extended drain intervals. Do not exceed 12,000 miles or one year with other brand filters unless longer intervals are recommended by the vehicle manufacturer. Always change filter when changing oil.
• Check oil regularly to maintain proper fill levels.

AMSOIL Ea Full-Flow Oil Filters stop smaller particles, flow more oil and last longer than regular filters. For best performance, use AMSOIL Ea Full-Flow Oil Filters.

COMPATIBILITY

AMSOIL Signature Series Synthetic Motor Oil is compatiblewith other conventional and synthetic motor oils. Mixing other oils with AMSOIL motor oils, however, will shorten the oil’s life expectancy and reduce its performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

Aftermarket oil additives are not recommended for use with AMSOIL synthetic motor oils.

HEALTH & SAFETY
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).

Click here to view the MSDS Data Sheet for AMSOIL ATM.

Keep out of the reach of children. Don't pollute. Return used oil to collection centers.

TYPICAL TECHNICAL PROPERTIES
Signature Series 100% Synthetic 10W-30 Motor Oil (ATM)
Kinematic Viscosity @ 100°C, cSt (ASTM D-445)10.0
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)62.3
Viscosity Index (ASTM D-2270)147
CCS Viscosity, cP @ (°C) (ASTM D-5293)4278 (-25)
Flash Point °C (°F) (ASTM D-92)230 (446)
Fire Point °C (°F) (ASTM D-92)256 (492)
Pour Point °C (°F) (ASTM D-97)-47 (-52)
NOACK Volatility, % weight loss (g/100g) (ASTM D-5800)4.1
High Temperature/High Shear Viscosity
@ 150°C, 1.0 X 106 s.-1), cP (ASTM D-5481)
3.11
Total Base Number (ASTM D-2896)12.5

LSPI Super Knock Prevention

Sequence IIIG Engine Test + Motor Oil Comparison

Cold Flow Pour Test AMSOIL vs Conventional Motor Oil

Did this product meet your expectations?

(click on a star to rate)
Product Name: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)
Current Rating: 4.91 out of 5 stars
Total Votes: 77 vote(s)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by TurboZ: space

FULL CONFIDENCE IN AMSOIL!

I've used Amsoil in my personal & family vehicles for over 10-years now. For these applications I use the Signature series 5W, and 10W-30. Since switching to Amsoil I've had zero mechanical motor issues and both engines are now approaching 200,000 miles and still running strong! I'm a DIY home mechanic so my cost per car is about $65 a year (including everything: tax, shipping, oil and filters).
Amsoil is... Superior protection with just one oil change per year, per car! You can't beat that!

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dog: space

No other oil

I use Amsoil in my farm equipment and vehicles. Use nothing else.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by David: space

Have used it faithfully for years

It was originally recommended to me by a friend nearly 20 years ago and I have used nothing in my vehicles but Amsoil lubricants ever since. I have a pick up with nearly a quarter of a million miles on it and still going strong. I think that they are the best products made for all your vehicles, bar none.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jerry: space

Again

Good product

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Flemwad: space

I've used your product since 1986

I have it in both my vehicles 2005 Toyota tundra and in my 2015 Toyota Camry I love the stuff words can't describe. Zero friction zero where . I have six of my closest friends all hooked on it too and they love it as well

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Richard: space

Great product

My engine and transmission both have responded very well to your products. My engine even runs smoother

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by R Speakerphone: space

Improves gas milage

There seems to be a slight advantage using Signature Series over the XL oil. It seems like I get an additional one or two miles per gallon when using Signature Series compared to XL. One thing that is unusual about Signature Series is that it can take on a red tint after a few thousand miles. I was concerned that this might indicate that transmission fluid had contaminated my engine oil (?). Calling customer service and speaking with a technician, I was assured by the technician that this is caused by the anti-oxidants in the oil that sometimes take on a red tint.
So far, I'm very happy using Amsoil products and will continue to do so.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by G: space

I would like to by this oil again

Great customer service

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by CruzCTRL: space

I'm glad I changed my oil

With Amsoil, I am saving time not waiting at the dealership, not paying them to change my oil, not worrying if my oil cap is tight; now I'm changing it myself every 10,000 miles, gaining 3-5 MPG, and, if I catch the deal, it's delivered to my house for free. All pros, no cons.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Al: space

2007 Dodge

Have been using this product since I bought my truck new in 2007. Have seen an increase in mpg. Recommend the oil.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by mtncamp: space

10-30 oil

Been using Amsoil for around 6-8 years on my 1999 Yukon with 205,000 miles had oil tested about month ago test come back with very good results no probelms at all. The 1997 truck has Amsoil in engine and transmission pulls camper 198,000 miles no issues so far. And all my small engines has Amsoil in them also

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Sergey the Welder: space

This rocks!

Use this for our 2009 VW Routan SEL Premium with 4.0L, and the van loves it! We have taken it up and down west coast numerous times without an issue!

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dan: space

it's all I use

I have used only AMSoil since 1982, best I have ever used.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Poppy: space

Love this oil

Love this oil. I use it in my Toyota Camry and 4Runner. Along with the dedicated amsoil oil filter it is great.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by TJ: space

I would purchase again for my Turbo Honda Civic

I use this in my Turbo Honda Civic 400+ Hp. At normal drain intervals and hasn't failed me yet excellent gas mileage and protection . Also use Amsoil Ea oil filter

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Capgoat6: space

Best Oil Always

Signature series has always held the highest protection standards for engine oil. Never an oil problem, and knowing that you are protecting the powerplant for your vehicle is so important nowadays.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Cool Breeze: space

I would buy this product again and again

I have used Amsoil products on both my motorcycle (2012 Victory Cross Country Tour) and car (2007 Dodge Magnum SXT) for many years, after the initial NEW break-in of their engines. This is an excellent product that I would recommend all to use.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Stephen: space

Tried and true go to oil

This is a great fully synthetic oil that never disappoints. I love the extended change intervals that I get with this product. I can run this oil for extended drain intervals and not worry one bit due to the quality of this product.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Doug in So Cal: space

The most important thing you can do for your car.

The three most important things you can do for your car: warm it up, drive slowly as the moving parts warm up, and change the oil regularly. Since I wanted my Toyota truck to last, and I hate to change the oil, I use Amsoil. It's superior, and it only has to be changed once a year. Really! I ran fossil oil until after the engine was broken in, like 25,000 miles or so, then Amsoil for engine, trannie and differential since then. I bought my truck new in 1998, and it now has 344,000 miles on the original motor and trannie. Everyone who knows, knows Amsoil is far and away the best.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by slopoke: space

This is all I use

I have been a preferred customer since 1989. All my vehicles, Cars and Pick ups have the 10w-30 signature since new. 200K miles plus on each, and still running strong. Replaced a valve cover gasket on a 1993 Chevy 4 cyl. with 180K miles, top of cyl. head brand new with no gunk. Was using the Amsoil By-pass system with this car.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JR: space

Great Product

I have been using Amsoil on all my vehicles for a couple of years. I really enjoy the extended change intervals and the protection Amsoil provides. This is the only oil I will use. Engines seem to run a lot smoother and gas mileage has increased a bit.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jerryc: space

best oil

Using 30 wt in hour Honda Pilot as it leaks and burns the 5 wt.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Hooligan: space

This stuff is Great!

Used in my well cared for 1994 subaru legacy engine with 250k miles and after only using conventional oil. Engine sounds and drives better than I can ever remember. Engine always sounded a little strained/frantic above 4.5k rpm, now sounds like lower rpm just faster. Totally happy.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by HB: space

Good Stuff

I have used Amsoil oils in my vehicles for 15 years. All of them have been 1990's or older. They keep the trucks/car running great! Not only that, but changing oil once a year is so much nicer with multiple vehicles than every 3000 miles.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Doogie: space

Only Oil I Use

Use this oil in all my personal vehicles

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joe: space

Signature Series 10W-30

I have a 2013 Hyundai Sonata. Great car. I have been using Amsoil after the first scheduled oil change and have noticed better performance, meaning the engine cranks over easier. The car runs, my opinion, a lot better. During my driving and idling with this car, I noticed that the engine has a small pinging noise. Soon after I get a recall notice in the mail from Hyundai that during the engine building process, there were small metal shavings that were not completly taken care during the the assembly of the main bearings, thus this will cause a "pinging in the engine. Huyndai will futher investigate this matter and send another notice explaining a course of remedy. I was using Amsoil 5W-20 signature series oil, and since I live in Utah and according to the owners manual I can use 10W-30. I purchased 10W-30 signature series oil and when the time came to drain and fill with oil, I put in the 10W-30. There is no pinging noise, however to be truthful, I think because of the heavier oil I have not been getting the mileage that I did with 5W-20. But i'm willing to sacrifice milieage for a heavier oil that could outlast the Hyundai problem. I highly recommend Amsiol oil.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Loaded Diaper: space

Real Good Oil

This oil is used in my 675 hp BBC.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Sam: space

Only oil I'll use in the miata

I'm very picky about the oil I run in all my vehicles. I have a first generation miata with very low miles that only gets fed this oil. It comes out very useable and clean still even after about 7500 miles that I run it too which consists of a lot of very high engine speed at 4k and above.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Popo: space

Great Results

My truck is running so much better! The engine seems so much smoother.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by don't have one: space

Best Oil on the market

I don't use any other product in my vehicles, only Amsoil Baby.. if you want the best buy the best here it is Amsoil.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bob: space

Not worth the hoops you have to jump through

The oil is good, but with the membership fee and high shipping costs I am going back to Mobile 1 as I did not see much if any of a difference. There is just to many hoops they make you jump through. There should just be a cost to buy it and no membership fee that AMS Oil makes people think they are locked in to buying oil from them so they can "get the most of the membership". I think most people find annoying and just go buy another oil rather than pay high prices on top of shipping and also a fee just to buy it at a reasonable price.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by DaveTheDoode: space

Your engine will run forever!!!

Using Amsoil in all my vehicles for loong years and never had engine fail!!!

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Archer m: space

Signature 10w-30

I used this in my 1998 jeep Cherokee 4.0 and gained 3 pounds of oil pressure over a competitors high mileage 10w-30 overall I would highly recommend. But next time I will use the premium protection 10w-40 because the older jeep engines do have flat tappet camshafts and like extra zinc. I just bought a 1989 jeep Comanche with a renix 4.0 that had a wiped cam because lack of quality oil (not enough zinc) and I'm replacing an engine in a 1997 Jeep Wrangler 2.5 for a friend of the family because of the same reason. Great oil!!!

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gary: space

Good product; I've use it for many years.

I use AMSOIL motor oils in all my vehicles, have used them for many years and consider them superior to all other motor oil brands.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Adam Delgado: space

BEST OIL

Best oils ever hands down run it in all my cars including my 331

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by old guy: space

Great

I only use Amsoil in everything i own .

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jomo Watts: space

10W-30 Synthetic

Best investment for any vehicle long term, 25,000-mile intervals for oil and filter. You save so much and the quality of the oil is far better than all I've tried!!!

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by ffokcaj: space

Have

By using amsoil it is saving money in the long run {less oil changes every year]ect.

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Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Five cars and one motorcycle: space

Yes I would buy again

Yes I would buy again been using this product for years about 20 years

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JACK I.: space

i run amsoil in all my vehicles

Great oil. No problems

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by John: space

Definitely buy this oil again

I use Amsoil exclusively in all my vehicles and I have do so for years. The cars include a Jaguar Vanden Plas with 136,000 miles, a Hyundai XG350 with more than 360,000 miles, and a 1990 Chevrolet Celebrity 3.1 V6 with well over half a million miles on it. None of them have ever required any significant engine work and all drive well, use almost no oil and get excellent gasoline mileage. Additionally, I use Amsoil in a restored 1932 Ford V8, again, with no problems at all. There isn't any other oil I would even consider purchasing. Obviously, I use different Amsoil in different vehicles according to specifications.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Shrimp: space

Lifetime Customer

I use Amsoil in both my car and my motorcycle! Better than anything out in the market!

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chris: space

10W 30 Motor Oil

Great product to buy and also dependable

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by BobCat: space

Very pleased with the performance of Amsoil products

I started using Amsoil Engine Oil in a higher mileage (130k) V6 and have noticed less lifter noise on startup. The oil seems to have good viscosity after 3k miles which should indicate longer oil change intervals. I also changed all fluids (diffs, trans, transfer case) over to Amsoil and have been very pleased with how the drive train feels. Of course new fluid always makes it better but it seems to coast and accelerate better than ever so I think the fluids have improved the vehicle performance slightly. At this time I haven't noticed any drastic MPG improvement but I do think there's just a little more power.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by BullderBob: space

Long Time User

I use AMSOIL 10-30 Signature in 3 vehicles,,and have an AMSOIL user for over 25 years.
I use 10-30 Signature in all 3 vehicles,and AMSOIL Diesel oil in my daughters Class A motor home

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Milton: space

Oil

Love this oil it's the best

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Daniel: space

Buy al time to replace your oil

I used this oil in my cars, good performance and gas improved. I recommend 100/ I put in my Acura TSX real pure Synthetic

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Kenny: space

Works great good

I use this in my 454 big block one tone and she works hard pulling a 14000 pound trailer fantastic love it

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Stephan: space

Will buy again

Oil works great, quieter smoother running engine .

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Walter: space

This product is the best and away Amsoil

This oil I use in my trailblazer and impala

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Andrew: space

Works Good

I run this oil in a 1993 Dodge W250. This oil works great in this old truck. I am very happy with Amsoil, it is all I run in my equipment.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Howard: space

Older is better

A little thicker for an older car with many miles.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Larry: space

Great oil!!

I believe synthetic oils are great for any moving metal parts. No wear, No friction, saves money in years to come and makes my engines very dependable. My Pontiac now has over 260,000 miles and uses no oil, no smoke. Thanks to Amsoil!

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jeremiah: space

The only Motor Oil I buy

If you were looking for the best you've found it! As simple as that!

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jeremiah: space

Best in the World by Far!

The most superior motor oil in world! It actually last 25,000 miles in my 2009 Toyota Venza and 2007 Chevy Malibu! When I drain it at 25,000 miles it doesn't look like its even lost its viscosity or characteristics! Best oil on the planet!

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Cody: space

I am a devout amsoil fan!!

I have always loved amsoil products. I have a 2001 ss monte carlo and unknown to me that my motor had a internal coolant leak and I have used amsoil in it forever. I had put on over 200k on this motor w/leak before I developed a rod knock. I give amsoil all credit in that this engine went that long before it gave out. Love amsoil

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Shane: space

Great stuff

Its great stuff use it in my 1999 Tahoe

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by David: space

Ford Pickup.

Used in my pickup along with Amsoil gear oil in the rear end and noticed an increase in fuel mileage.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Craig: space

Great product

I don't put anything else in my vehicles.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Carolina Traveller: space

I will be using this from now on in ALL my vehicles.

Learning that most "Conventional" oil lose is caused by consumption (boil off, blow by, clearances ect).
I decided to give it a try in my 340K mile Pontiac (45K on a new rebuilt 3.8l HO V6).
Not only did the oil lose stop it actually helps cool the engine down better now.
Bonny runs smoother. She has always been fast so I do not notice a performance increase.
Gas mileage improved. I was getting 17-18 mpg highway. Now I get 22-23 mpg.
I get 16 mpg city period. No improvement there. My suspicion in my lead foot has a lot to do with that.
At first consumption seemed to be the same.
Talking with the local guy he reminded me of the oil cooling lines and oil cooler underneath.
That's a full extra quart of conventional right there.
Once that boiled off (2 weeks) the oil level stayed constant.
I am on my second oil change now. New Amsoil recommended oil filter and new Signature Series 10W-30 Synthetic Motor Oil.
Funny thing was that after 15K miles it was still pretty clear.
I have 5K on her since this oil change. Still clean on the stick.
I became a preferred customer for the savings it offers me and my 9 vehicles.
Cutting the oil changes down to 1/4 of what they were makes up for perceived "extra" expenses.
the performance and stability of it makes it well worth it.
Signature Series 10W-30 Synthetic Motor Oil will be going into the Motor Home next.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Roge: space

Great oil, specially for boosted cars

I've tried them all, and I was never happy entirely with the other oils. Some burned, some lost viscosity way too fast and some looked straight black just after a few thousand miles. That being said so far I'm loving Amsoil, doesn't burn, always looks clean at changes and holds viscosity. So far, signature series has been my favorite oil for my 2004 Evo 8. +1 to Amsoil I feel like I can trust it when I tracking the car or driving it around the streets.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Terry: space

Freind of mine

I actually recommended to my friend so its for him and he's been using it for years. I have been using AMSOIL products for over 38 years. I have used almost every product AMSOIL makes.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Woodsman: space

Beat This!!!!

2002 Ford Ranger, 598,898 original miles. V6.
Amsoil Filter and Oil.
Still running strong.
Dirt bikes, tractor, and 3 other vehicles,......I never used an "additive".....only fluids going in my vehicles are AMSOIL!!!!!!

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Old guy: space

I used this product because it delivers on it's promises.

I replaced a leading brand with Amsoil because genuine lab tests demonstrated superior performance in our hot climate. It ,as a bonus stay's cleaner longer in my motorcycle and high performance boat and car engines than other synthetics and petroleum based oils, which makes for far less combustion made carbon and fuel contamination, the two main engine damaging agents that accumulate in the crankcase..

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by none: space

Synthetic products

When I went to all synthetic products on the motor home the transmission stopped slipping and my mileage also improved.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ryan: space

Best oil as usual

Bought this product for my lawn mower. Was a great replacement to regular oil. Performs great. Experiencing easier starts and more quiet performance. Exactly what I was expecting from amsoil.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by H: space

I've used this oil , it's the best on the market

I use this oil from the 1st oil change 282,576 miles ago. No problem with the engine, it just goes and goes. We drive the car daily and for long distance and I never worry about the engine. I fully trust Amsoil.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)

Reviewed by Liz: space

My 2003 Jeep Liberty loves this

Smooth & starts well in all temperatures. thanks.

Item Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)
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