https://www.amsoil.com/p/signature-series-0w-20-synthetic-motor-oil-asm/
Signature Series 0W-20 Synthetic Motor Oil
• 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 25,000 miles or 1 year
Based on independent testing of AMSOIL Signature Series 0W-20, in ASTM D6891 as required by the API SN specification.
Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.