• Engineered for enthusiasts seeking maximum protection and performance.
• Precision-formulated with cutting-edge technology and a longstanding devotion to making the world’s best motor oil.
• The result: engine protection that blows the doors off the highest industry standards.

  Signature Series Delivers Powerful Protection

• Protects turbochargers 72% better than requiredC by the GM dexos1 Gen 2 specification.
• Robust anti-wear additives further reduce wear in metal-to-metal contact regions for maximum engine life.
• 75 percent more engine protection against horsepower loss and wear than required by the industry standard, extending the life of vital components like pistons and cams.
• Develops a strong fluid film that keeps metal surfaces separated.
• Fights viscosity breakdown better than the competition, providing superior protection of pistons, cams and bearings.
• Signature Series is barely challenged by the industry-standard testing, demonstrating only a 0.1% viscosity increase. Even when the test length is doubled, AMSOIL delivered twice the viscosity control required by the standard.
  

  Signature Series Keeps Engines Cleaner

• Provides 90% better protection against sludge.
• Formulated with superior thermal durability that resists breakdown and keeps pistons clean.
• Controls heat and minimizes performance-robbing deposits.
• Maximizes engine life and performance.
• Has 50% more detergents to help keep oil passages clean and promote oil circulation.
• Fights volatility 38% better than Mobil 1 and 17% better than Royal Purple, helping reduce oil consumption and keep valves clean.
• Is fortified with a heavy treatment of detergent additives, delivering 28 percent more acid-neutralizing power than Mobil 1 helping engines stay cleaner, longer.
• Even after doubling the length of the industry-standard test, it delivered 40% cleaner pistons than required by the standard.
  

Dedicated engine builders and mechanics put in long hours honing their craft. These architects of powerful, high-performance engines turn to Signature Series to protect their passion.