Engine Protection
AMSOIL Motor Oil
The world's best synthetic motor oils — engineered for maximum protection, performance, and extended drain intervals since 1972.
Synthetic Motor Oil
Signature Series, XL, and OE — up to 25,000-mile drain intervals. The world's best synthetic motor oil for gasoline engines.
Diesel Oil
Signature Series Max-Duty for Duramax, Cummins, and Power Stroke diesel engines. Superior soot handling and wear protection.
European Motor Oil
Engineered for BMW, Mercedes-Benz, VW, Audi, and Porsche. Meets LL-01, MB 229.5, VW 502.00/505.00 specifications.
Motorcycle Oil
Wet-clutch compatible oils for Harley-Davidson V-Twin, metric cruisers, sport bikes, and dirt bikes.
Why Choose AMSOIL Motor Oil?
AMSOIL pioneered synthetic motor oil in 1972 when it developed the first API-qualified synthetic motor oil in the world. Over 50 years later, AMSOIL continues to be the leader in synthetic lubrication technology, offering the most advanced motor oils available for every application — from daily drivers and performance cars to diesel trucks and European vehicles.
First in Synthetics®
AMSOIL's commitment to synthetic lubricant technology began when founder Al Amatuzio, a fighter jet squadron commander, recognized the superior performance of synthetic lubricants used in jet engines. He applied that same technology to automotive lubricants, creating a product line that delivers unmatched protection, performance, and value.
Independent Testing Proves AMSOIL's Superiority
In independent testing, AMSOIL Signature Series Synthetic Motor Oil provides 75% more engine protection against horsepower loss and wear than required by the industry's toughest standard (the GM dexos1 Gen 3 test). This translates to longer engine life, better fuel economy, and fewer repairs over the life of your vehicle.