Become an AMSOIL Preferred Customer and Save up to 25% on today’s order. JOIN NOW
Product/Account Links
AMSOIL Accounts
AMSOIL Motor Oil
AMSOIL Other Products
Other Products
AMSOIL Signature Series 0W-40 Synthetic Motor Oil
AMSOIL Signature Series 0W-40 Synthetic Motor Oil
AMSOIL Signature Series 5W-20 Synthetic Motor Oil
AMSOIL Signature Series 5W-20 Synthetic Motor Oil
AMSOIL Signature Series 0W-30 Synthetic Motor Oil
AMSOIL Signature Series 0W-30 Synthetic Motor Oil
AMSOIL Signature Series 5W-30 Synthetic Motor Oil
AMSOIL Signature Series 5W-30 Synthetic Motor Oil
AMSOIL Signature Series 10W-30 Synthetic Motor Oil
AMSOIL Signature Series 10W-30 Synthetic Motor Oil
Save up to 25% on Amsoil Products

AMSOIL Signature Series 0W-20 Synthetic Motor Oil

AMSOIL 0W-20 Synthetic Motor Oil
AMSOIL 0W-20 Synthetic Motor Oil
Product Highlight
AMSOIL 0W-20 is designed for people who demand the highest level of protection and performance. Precision-formulated with cutting-edge technology and a long-standing commitment to making the world's best motor oil. As a result, engine safety exceeds even the most demanding 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
Product Description
Protects Against Engine Wear
AMSOIL 0W20 Signature Series Synthetic Motor Oil produces a thick fluid coating between metal surfaces, reducing wear in metal-to-metal contact regions for extended engine life.

The IVA Sequence Engine Test simulates long periods of stop-and-go driving and must be passed in order to meet the API SN criteria. For 100 hours, the test engine alternates between 50 minutes of idling and 10 minutes of high rpm, inducing engine wear.

After that, the camshaft is assessed for wear in 84 different spots, and an average score is calculated. To make the test even more difficult, we chose Signature Series 0W-20, the line's lightest viscosity. AMSOIL 0W-20 Signature Series Synthetic Motor Oil offers 75 percent greater engine protection against horsepower loss and wear1 than the industry norm, allowing crucial components like pistons and cams to last longer.
Cam lobes - AMSOIL 0W20
Protects Pistons from Low-Speed Pre-Ignition
Signature Series is equipped with a cutting-edge detergent system that guards against harmful deposits and low-speed pre-ignition (LSPI). To boost power and improve fuel economy, most new engines use gasoline direct injection (GDI), which is often combined with a turbocharger. When these new technologies are combined with a poorly formulated motor oil, LSPI is promoted and engine performance is jeopardized. The spontaneous ignition of the fuel/air mixture before spark-triggered ignition is known as LSPI. It is much more destructive than typical pre-ignition in today's advanced engines. A properly formulated motor oil is essential for engine protection.

Original equipment manufacturers (OEMs) such as General Motors (GM)* have addressed the problem by developing tests to determine the ability of a motor oil to prevent LSPI. In the engine test required by the GM dexos1 Gen 2 specification, AMSOIL 0W20 Signature Series Synthetic Motor Oil provided 100 percent protection against LSPI1 with zero occurrences over five consecutive tests.

Turbochargers are safeguarded.
Our proprietary synthetic formulation is designed to withstand oxidation and neutralize acids. The AMSOIL 0W20 Signature Series Motor Oil protects against deposits that are common in high-temperature engine environments. Turbo coking is a process in which some oils break down and form harmful bearing deposits as a result of the extreme heat and stress that turbos generate. Turbos can lose performance or even fail completely over time.

The GM Turbo Coking Test, which consists of 2000 cycles of extreme heat soaks, was used to put Signature Series to the test. To pass the test, an oil must keep the temperature change within the turbocharger to less than 13%. The temperature increase was limited to only 3.6 percent, protecting the turbocharger 72 percent better than the GM dexos1® Gen 2 specification2.
Testing - AMSOIL 0W20
Up To 25,000 Miles Protection - AMSOIL 0W20
Extends Drains: Protection Guaranteed
AMSOIL 0W20 Signature Series Synthetic Motor Oil has reserve protection, which means you may go longer between oil changes if you want to – up to 25,000 miles, 700 hours of operation, or one year*, whichever comes first*. Our intrinsically stable synthetic formulation and long-drain additive system resist oxidation and neutralize acids for longer periods of time. The Signature Series is engineered to provide superior engine protection, cleanliness, and performance over long drain intervals. It gives you peace of mind so you can plan oil changes around your other commitments.

1 Based on independent testing of AMSOIL Signature Series 5w-30 motor oil in the LSPI engine test as required by the General Motors dexos 1® Gen 2 specification.
2 Based on AMSOIL Signature Series 5W-30 independent testing in the GM turbo coking test.
AMSOIL 0W-20 OE Motor Oil vs. 3
4 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 in the ASTM D6593 engine test.
* All branded names and images are the property of their respective owners, and in some countries, they may be registered trademarks. Their usage makes no claim of association or sponsorship, express or implicit. AMSOIL designed all of the items listed here for use in the applications depicted.

Horsepower is preserved.
AMSOIL 0W-20 Signature Series Motor Oil's extreme durability ensures that your engine runs stronger and longer. We put Signature Series 5W-30 Synthetic Motor Oil in a Ford* F-150 with a new 3.5L Ecoboost engine to see if it could protect turbocharged direct-injection (TDGI) engines against torque and horsepower loss over a 25,000-mile drain interval. To evaluate horsepower and torque retention, power sweeps were performed at the start and end of the test. Signature Series, as shown in the graph, assisted in maintaining engine performance throughout the 100,000 mile test.
Preserves Horsepower - AMSOIL 0W20
Limits Oil Consumption

AMSOIL 0W-20 Signature Series has a consistent molecular structure that prevents evaporation and keeps the oil where it belongs: on your engine. When oil gets hot, lighter molecules burn off or evaporate, generating volatility (burn-off). As a result, oil thickens, additive imbalances occur, and emissions and oil consumption rise. The NOACK Volatility test is the industry standard for determining the evaporation rate of motor oil at high temperatures. It calculates the percentage of burn-off after a motor oil is exposed to steady airflow at 482 degrees Fahrenheit for one hour. A lower value suggests stronger evaporation resistance. The volatility of Signature Series is well below the API limit, eliminating the need for regular oil top-offs and lowering vehicle emissions.
Limits Oil Consumption - AMSOIL 0W20
Easier Cold-Starts
AMSOIL 0W20 Signature Series contains no paraffins (wax) and remains liquid even at -58°F. Other motor oils thicken at extreme cold, denying lubrication to vital moving parts, speeding up wear, and even preventing vehicles from starting. The Signature Series offers a 66 percent improvement in cold-temperature performance for easier starting, higher fuel economy, improved oil flow (as seen below), and less wear.
Easier Cold-Starts - AMSOIL 0W20
Cold Pour Test - AMSOIL 0W20
Maintains Protective Viscosity
We created the AMSOIL 0W-20 Signature Series with higher thermal durability that outperforms conventional and synthetic motor oils in terms of breakdown resistance. The Sequence IIIH Test evaluates a motor oil's capacity to resist the detrimental effects of heat using the Chrysler 3.6L Pentastar engine. The test is carried out at oil temperatures of 304oF, which is 100oF higher than usual operation, in order to increase oil thickening and deposits. Despite the harsh conditions, the Signature Series kept pistons clean and thickening to a minimum of 6%, compared to the intended standard maximum of 150 percent. 1This maintain-grade performance contributes to maximum power and fuel economy while also ensuring advanced technologies such as variable valve timing (VVT) operate as intended throughout the drain interval.
Maintains Protective Viscosity - AMSOIL 0W20
Keeps pistons clean
1 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.

0W-20 (ASM): API SN (Resource Conserving), SM...; GM dexosl Gen 2 (supersedes 6094M); ACEA A1/B1; Ford WSS-M2C947-A; Chrysler MS-6395; ILSAC GF-5, GF-4... Fortified with detergents that exceed the dexos 1 Gen 2 sulfated ash specification.
AMSOIL synthetic lubricants are the best choice for your vehicle. They are engineered to provide excellent lubrication, protect against engine wear and tear.  AMSOIL provides the ultimate synthetic lubrication solution for today's high-performance engines. AMSOIL products are made with all-synthetic base oils and a unique additive system that provides unsurpassed protection against viscosity shear, deposits, rust, corrosion, foaming, and more.
Product Size
Code Package Size Unit of Measure Product
ASMQT (ASMQT-EA) Quart Each AMSOIL 0W-20 Synthetic Motor Oil
ASMQT (ASMQT-CA) Quart Case of 12 AMSOIL 0W-20 Synthetic Motor Oil
ASM1G (ASM1G-EA) Gallon Each AMSOIL 0W-20 Synthetic Motor Oil
Case of 4 AMSOIL 0W-20 Synthetic Motor Oil
ASM30 (ASM30-EA)
30-Gallon Drum
AMSOIL 0W-20 Synthetic Motor Oil
ASM55 (ASM55-EA)
55-Gallon Drum
Case of 2
AMSOIL 0W-20 Synthetic Motor Oil
Technical Information
Share with your social newtork