AMSOIL Beats Other Engine / Motor Oils on the Dynometer

NOTICE: July 2013

We have an updated page that has newer test results for AMSOIL vs Castrol Edge, Lucas, Mobil 1, Pennzoil, Quaker State, Royal Purple and others.

Click Here to See This New Page


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What fits all your vehicles

Interstate Battery System of Detroit very satisfied with the results of Amsoil in their fleet!

Running a 10W30 oil for 240 hours!

AMSOIL was the first synthetic oil

Mercedes-Benz and motor oil law suits

Interceptor 2-cycle oil

Companies wanting to buy out AMSOIL

Harley-Davidson Oil. Which is better?

Regarding your factory warranty

Crackdown of obsolete oils in California

Company History

Motorcycle Fluids