PREMIUM AUTOMOTIVE PROTECTION: SHIELD® CLASSIC (CONVENTIONAL) Engineered for High-Output. Built for Stability.

Mammoth is proud to supply Phillips 66® Shield Classic, the premium conventional solution for engines requiring a heavier-viscosity oil. Specifically designed for high-temperature operations and older high-performance street or competition engines, this 20W-50 formulation provides a robust protective layer where thinner oils might fail. Whether you are maintaining a classic fleet or high-output equipment, Shield Classic delivers the specialized film strength needed for severe service and high-heat environments.

WHY MAMMOTH TRUSTS SHIELD® CLASSIC:

• High-Temperature Film Strength: Specifically formulated for gasoline engines that prefer an SAE 20W-50 weight, providing superior lubrication and oil pressure stability in extreme heat or competition settings.

• Comprehensive Wear Defense: Engineered to protect turbocharged direct injection and flex-fuel systems, offering a reliable shield against friction and engine wear under heavy-duty operational stress.

• Sludge & Varnish Control: Our formulation actively resists the formation of internal deposits, keeping engines cleaner and ensuring that high-performance components remain free of sludge and varnish.

• Thermal Breakdown Resistance: Built to withstand severe service without thinning out, this oil guards against rust, bearing corrosion, and foaming to ensure long-term engine health for specialized applications