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Learn How to But AMSOIL at Wholesale Prices. Important Information About AMSOIL Synthetic Motor Oils, Lubricants, Fuel Additives, Oil and Air Filters... AMSOIL created the synthetic motor oil market, and we continue to set the standard for performance. Our definition of synthetic doesn't waver. Consumers can be assured that what they see on the label is what they'll see in the bottle. With AMSOIL, people get what they pay for.