Amsoil, Inc. is a corporation based in Superior, Wisconsin that manufactures synthetic lubricants and filters. They were the first to manufacture a full synthetic motor oil, transmission fluid, and differential gear lube for automobiles. Due to this, their slogan is "The First in Synthetics."
Amsoil, Inc. was founded by Col. Al Amatuzio (USAF Retired) in 1972. Prior to founding Amsoil, Amatuzio was a fighter pilot, line maintenance officer, and squadron commander during the Cold War era. Having to use synthetic lubricants in the jet engines he maintained, he became aware of the significant benefits of using synthetic instead of petroleum-based oil.