4 Seasons Oils

Vacaville, CA

Authorized Dealer

AMSOIL Motorcycle oil

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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AMSOIL Resists Viscosity Breakdown

Amsoil Motorcycle oil resists viscosity breakdown more the any of the leading Synthetic motor oils. This means the oil does not break down and because of the AMSOIL’s superior additives Harleys can run 20-50 degrees cooler. This is especially important during the summer months when Harley-Davidson engines could be prone to overheating.