Performance Synthetics is an authorized AMSOIL dealer based in Moses Lake and shipping Preferred Customer pricing across Central Washington. Every order flows through AMSOIL direct at the dealer referral rate — questions about viscosity grades, drain intervals, or fitments are answered by the dealer directly at (509) 986-7941.
Built for enthusiast engines, not fuel-economy test cycles.
The differences below are what separate AMSOIL’s 100% synthetic line from the mass-shelf blends at the parts store — and why the dealer points enthusiast builds toward it.
Fewer oil changes per year
AMSOIL Signature Series holds a 25,000-mile / 1-year drain interval under normal driving, against the 3,000–5,000 miles a typical conventional oil asks for, and the 7,500–10,000 miles a mass-shelf synthetic will claim on the bottle. For an enthusiast driver, that is several used-oil disposal rounds you simply skip each year.
Film strength under load
Cold-start, towing, and track-day all push oil into the high-shear, high-temperature window where mass-shelf synthetics thin out. AMSOIL’s 100% synthetic base stock keeps a stable film on bearings and cam lobes when temperatures climb — fewer wear metals in the used-oil report and longer bearing life on engines that see real load.
Built for CAFE, not durability
Mass-shelf synthetic blends have to hit API/ILSAC fuel-economy numbers on the EPA test, which pulls the formulation toward lighter base oils and friction modifiers. AMSOIL is not chasing those targets — the 100% synthetic formula prioritizes durability and detergency, which is what matters on a built motor that sees high-load operation.
Ready to enroll through the dealer referral?Pricing comes from AMSOIL — not added by the dealer.
Enroll in Preferred Customer