Advanced engine technology and demands of everyday driving generate severe conditions that can challenge motor oil and engine life. Signature Series delivers the ultimate protection against everyday extremes like towing and extended idling. Don’t just take our word for it; read on for proof. Do you have long commutes? You can go 25,000 miles, one year, or 700 hours of operation between oil changes using Amsoil signature oils.

In tests conducted by independent labs, AMSOIL out performed MOBIL 1 and ROYAL PURPLE by 36%.
AMSOIL provides 90% better protection against sludge which is cause by oil thickening due to excessive heat and lack of detergents.

AMSOIL provides far superior protection over the competition. Kept bearings looking like new even after 100,000 miles. Read More about the benefits of Signature Series Synthetic Motor Oil here.