HEAVY DUTY PROTECTION: GUARDOL® NG-D® (SYNTHETIC BLEND)

Engineered for Versatility. Built for Longevity.

Mammoth is proud to supply Phillips 66® Guardol NG-D, the heavy-duty solution for fleets running both natural gas and diesel. Whether you're managing transit buses, delivery trucks, or converted CNG engines (Cummins, Volvo, Detroit Diesel), this synthetic blend is designed to handle the unique thermal stress of dual-fuel environments. It provides a specialized, low-ash formulation that protects critical engine components while maintaining full compatibility with modern exhaust aftertreatment systems.

WHY MAMMOTH TRUSTS GUARDOL® NG-D:

• Dual-Fuel Mastery: Specialized anti-wear additives provide a robust shield for both diesel and natural gas configurations, reducing the risk of misapplication in mixed-fleet operations.

• Extended Service Life: Exceptional resistance to oxidation and nitration means you can safely push for longer drain intervals without sacrificing component protection or oil stability.

• Clean-Engine Tech: Our formulation actively fights sludge and valve seat recession, keeping your engines in the shop less and on the road longer by maintaining internal cleanliness.

• Stable Performance: Engineered to resist foaming and aeration, ensuring consistent oil pressure and reliable lubrication in the toughest high-heat operational conditions.