AMSOIL Motor Oil

AMSOIL Signature Series oils last up to 25,000 miles, 700 hours of operation or one year, whichever comes first for normal service. In severe service conditions, Signature Series is rated for up to 15,000 miles.

For a 50:1 oil mix ratio, you'll need 2.6 fluid ounces of oil for 1 gallon of gasoline. This equates to 20 mL of oil for 1 liter of petrol. Use our 2-stroke oil mix calculator to calculate the precise amount of oil needed.

You can start your own AMSOIL Preferred Customer membership today for $10. This introductory price gets you a membership for 6 months, and to renew you'll pay $20 for a full year. Sign up today and save up to 25% on all AMSOIL products!

AMSOIL Signature Series motor oils meet and exceed industry standards like GM dexos1, Gen 2, Gen 3 and dexos R.

Zinc (ZDDP) anti-wear oil additives are heat-activated, providing a protective layer on metal surfaces and reducing friction and wear particularly in high-friction areas. This protection helps maintain engine performance over time, especially in high-stress areas like camshafts and lifters.

The MS, FS, and LS designations for AMSOIL's European motor oils indicate the SAPS (Sulfated Ash, Phosphorous, and Sulfer) concentrations: Full-SAPS, Mid-SAPS, and Low-SAPS.

For maximum protection, you should use AMSOIL V-Twin Primary Fluid which will NOT void your warranty. You can also use AMSOIL V-Twin Motorcycle Oil which was designed to be used as an engine oil, transmission, and primary fluid. Check here to find the best oil for your specific Harley.

AMSOIL is one of the best oils on the market because their products do precisely what we say they will do and they always outperform competing oil products in independent lab testing. Although you'll likely pay a bit more for their premium oils, you'll also save time and money in the long run by using the best.

ZDDP stands for Zinc Dialkyldithiophosphate. It's a common anti-wear additive in motor oils, particularly important for older engines and high-performance applications. AMSOIL High Zinc Motor Oils offer exceptional protection for engines with flat-tappet camshafts, modified crate engines, and supercharged engines.

Oils designed for classic cars, racing, or high-performance engines typically have higher zinc content. AMSOIL Z-Rod is specifically formulated with high zinc levels for these applications and is one of the best high zinc motor oils.