AMSOIL – Good Video and article on why you can confidently go 25,000 miles between oil changes using AMSOIL. Using a third party independent lab, AMSOIL tested a Ford 150 pick-up using AMSOIL Signature Series 5-30 motor oil. The engine was torn down and inspected and showed virtually no wear and ran like new even after 100,000 miles using AMSOIL Signature Series Motor oil and changing the oil only every 25,000 miles. AMSOIL offers “Bullet proof engine protection”.