Signature Series 5W-50 Synthetic Motor Oil in Quart Bottle 12 Count by Amsoil

75% more engine protection against horsepower loss and wear.1 50% more cleaning power vs. AMSOIL OE Motor Oil Protects turbochargers 72% better than required2 by the GM dexos1 Gen 2 specification. Trusted by professional engine builders Guaranteed protection for up to 25000 miles or 1 year 1Based on independent testing of AMSOIL Signature Series 0W-20 in ASTM D6891 as required by the API SN specification. 2Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.