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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.
AMSOIL Series 2000 0W-30 scored the biggest fuel economy savings ever recorded at the independent test facility where it was tested. This is one the reasons why I use the 0W-30 in my own gasoline engines.