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Every oil company says they're the best. Amsoil is the only one that proves it in writing and proudly gives out its ASTM results.
As shown in the ASTM D-4172 four-ball wear test, AMSOIL Synthetic 10W-30 Motor Oil produced the smallest wear scar of the tested lubricants such as Castrol Syntec, Vavoline Syn Power, Quake State Synthetic, Mobil Drive Clean, Pennzoil Synthetic, Mobil 1 Super Syn, Valvoline, Castrol GTX Drive Hard, Quaker State Peak Performance and Pennzoil with Purebase.
Dynamometer testing performed by Dyno-Pro, an independent shop in Illinois, showed that compared to a popular 10W-30 motor oil, series 2000 Synthetic 0W-30 provided an average of 2.22 horsepower increase and average of 2.75 foot-pounds torque increase.