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...
At one time, synthetic oil was made exclusively from polyalphaolefin and ester base oils (Group IV base oils). Then the landscape became a bit murky in 1999 when Mobil challenged Castrol when Castrol introduced an oil made from Group lll base oil and called it synthetic. The dispute played out before the National Advertising Division of the Better Business Bureau and Castrol prevailed. No big problem there. Group lll base oils offer good performance, and now GTL (gas-to-liquid) base oils have joined the Group lll segment...
Learn How to But AMSOIL at Wholesale Prices. Important Information About AMSOIL Synthetic Motor Oils, Lubricants, Fuel Additives, Oil and Air Filters.