Three lines. One synthetic base-stock platform.
AMSOIL builds every motor oil off the same synthetic base — the line you buy sets the drain interval, the price point, and the fit. Pick the line that matches how the engine is actually used; each one links straight to amsoil.com through the dealer referral tag, so Preferred Customer pricing applies at checkout.
Signature Series
AMSOIL’s flagship full-synthetic motor oil — engineered for the longest drain intervals AMSOIL offers and the toughest conditions enthusiasts throw at it. Best-in-class wear control and high-temperature stability.
Best for: tow rigs, hot-climate street, heavy-duty fleet
Shop on AMSOILExtended-Life
A synthetic-blend motor oil that beats OEM drain intervals by a wide margin at a friendlier price point — bridge oil for drivers who want AMSOIL durability without the top-tier spend.
Best for: commuter sedans, light trucks, mixed-use garage
Shop on AMSOILOE
Original-equipment-grade 100% synthetic motor oil priced for daily drivers. Meets the latest API and OEM specs while delivering AMSOIL’s synthetic base-stock quality at the cost-conscious end of the line.
Best for: daily drivers, dealer-fresh cars, fleet rotation
Shop on AMSOIL