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Signature Series provides 75% more engine protection against horsepower loss and wear than required by a leading industry standard.1
Signature Series achieved 72% better protection than required by a leading industry standard2, providing ultimate protection against extreme heat and the harmful deposits that can plague turbochargers.
Signature Series resists volatility better than other oils, helping reduce the need for frequent oil top-offs and limiting vehicle emissions.
Low-speed pre-ignition is the spontaneous ignition of the fuel/air mixture prior to spark-triggered ignition. This phenomenon is much more destructive than typical pre-ignition and has become one of the latest challenges to arise in today’s advanced engines. Signature Series Synthetic Motor Oil has been armed with an advanced detergent system and achieved 100% protection against LSPI.3
Signature Series has 50% more detergents to help keep oil passages clean4 and effectively provided 90% better protection against sludge.5
1Based on independent testing in the ASTM D6891 test using 0W-20 as worst-case representation. 2Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.3Based on independent testing of AMSOIL Signature Series 5w-30 motor oil in the LSPI engine test as required for the GM dexos 1® Gen 2 specification.4vs. AMSOIL OE Motor Oil5Based on independent testing of AMSOIL Signature Series 5W-30 in the ASTM D6593 engine test for oil screen plugging as required by the API SN specification.
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