
The accumulation of contaminants and chemical changes in the motor oil eventually make it unfit for further service.

“I’d always known AMSOIL was good, but this proved it. AMSOIL is the best.”

Motor oil myths abound. Here are five of the most persistent along with our myth-busting facts.

Find out everything you need to know about synthetic vs. conventional motor oil.
Motor oil, whether synthetic or petroleum-based, consists of molecular chains of hydrogen and carbon atoms, referred to as hydrocarbons. Petroleum...