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Blowing the doors off industry standards. AMSOIL Signature Series Synthetic Motor Oil...

  • Delivers 75% more engine protection against horsepower loss and wear than required by a leading industry standard1
  • Handles heat so well that it protects turbochargers 72% better than required by GM’s dexos1® Gen 2 specification2
  • Achieved 100% protection against LSPI3

Why choose amsoil


Extended line of lubricants for just about anything with an engine
Product performance that blows the doors off industry standards
Confidence of using products that offer field- and dyno-tested quality
A company of gearheads, racers and riders that shares your passion for performance
Formulated, blended and packaged in the USA

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Engine Builders Love AMSOIL

"If you have a car that you really love, you want to take care of it. That’s why I recommend AMSOIL."

~ Daniel Boshears, engine builder and Chief Mechanic at the Wellborn Musclecar Museum

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Diesel Enthusiasts Love AMSOIL

"In comparison to just running some of the standard fluids, we see better heat distribution in the bearings and in the steels on an extreme application."

~ Lavon Miller, Firepunk Diesel

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1Based on independent testing in the ASTM D6891 test using 0W-20 as worst-case representation.

2Based on independent testing of AMSOIL Signature Series 5W-30 in the GM Turbocoking test.

3Based on zero LSPI events in five consecutive tests of AMSOIL Signature Series 5W-30 motor oil in the LSPI engine test required by the GM dexos1® Gen 2 specification