Keep the car you love safe with 75% more engine protection against horsepower loss and wear than required by a leading industry standard*.
* As required by a leading industry standard. Based on independent testing of AMSOIL Signature Series 5W-30, in ASTM D7320 as required by API SN specification.
See why car enthusiasts, engine builders and racers also depend on AMSOIL fully synthetic oils to provide world-class wear protection for their vehicles.
The American Petroleum Institute sets the minimum standards oil must pass to ensure it will provide adequate protection. One of these standards, the Sequence IIIG Test, subjects oil to 100 hours of use at 150°C – much higher than normal operating temperatures – and measures its ability to prevent wear, deposits and more.
AMSOIL synthetic oils are hand-crafted for those who live for peak performance and demand the best protection – so you can continue to enjoy your vehicles to the fullest.
AMSOIL Signature Series Synthetic Motor Oil delivers:
*As required by a leading industry standard. Based on independent testing of AMSOIL Signature Series 5W-30, in ASTM D7320 as required by API SN specification.