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Before AMSOIL, there was no API rated synthetic motor oil. Before other oil companies "discovered" synthetic motor oil, AMSOIL already had the first motor oils on the market for years. Before specification GM4718M for General Motors synthetic factory fill was required, AMSOIL was already meeting the spec and making the grade.
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.
Greg Carroll, the creator of the super charger specified Mobil 1? as the only lubricant to use in the engine. To stress importance, he had a metal decal on top of the engine informing customers to use Mobil 1®. After Amsoil dealer, Dave Bigda, gave Greg Carroll a sample of Amsoil for testing, the metal decal came off of the engine. According to Dave, Carroll felt that AMSOIL was superior to Mobil 1® in protecting engines and drivetrain components. In other words, its the best oil he has seen.