Devoted to Protection

AMSOIL Signature Series Synthetic Motor Oil delivers 75% more engine protection against horsepower loss and wear than required by a leading industry standard*.

• 75% more protection against horsepower loss and wear
• 93% better piston deposit score
• Oil thickening limited to 82% below the standard

The superior performance of Signature Series extends the life of vital engine components such as pistons and cams.

*Based on independent testing of AMSOIL Signature Series 5W-30 in the ASTM D7320 Engine Test as required by the API SN specification.