4 Seasons Oils

Vacaville, CA

Authorized Dealer

Synthetic Motor Oil

Should I Use a Lighter Winter Oil Weight?

AMSOIL recommends using a lighter winter oil weight when the temperatures drop. This improves cold starts and maximizes wear protection at start up. Synthetic oils provide better cold starts because petroleum based oils contain wax. Wax thickens when it gets cold.  Amsoil Signature series 5-30 will actually pour at -50 degree F. Petroleum based oils …

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AMSOIL vs. Harley-Davidson Oil: How We Perform

AMSOIL 20-50 V-TWIN Motorcycle Oil surpassed Harley Davidson SYN3 motorcycle oil 6X better for much superior protection in independent lab tests.   Especially loss of  viscosity, compensator wear and transmission wear.  With AMSOIL 20-50 there was no “ticking” or “thunking” noise when tested. Harley Engines ran cooler and shifted smoother with Amsoil.  This article discusses the …

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