MAMMOTH PETROLEUM
778-370-3330
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.
PRODUCT RESOURCES
PERFORMANCE
Dual-Fuel Engineering: Optimized for high-performance in both Diesel and Natural Gas (CNG) engines.
Oxidation & Nitration Control: Industrial-grade resistance to thickening and oil breakdown in high-heat environments.
Advanced Dispersancy: Active protection that keeps soot and varnish in suspension, keeping engine internals "Mammoth" clean.
PROTECTION
Anti-Scuff Technology: High-strength molecular film prevents metal-on-metal scuffing and premature wear.
Valve-Train Integrity: Engineered specifically to prevent valve stem deposits and valve seat recession.
Sludge Defense: Formulated to stop the formation of harmful sludge and varnish before they start.
UPTIME
Extended Drain Capable: Field-proven durability that allows for more miles between service intervals.
Mixed-Fleet Optimization: One high-performance solution for diverse fleets, eliminating the risk of shop misapplication.
System Compatibility: Fully compatible with modern exhaust after-treatment systems.
COMPOSITION
RESISTANCE
PROTECTION
FEATURES & BENEFITS
Dual-Fuel Versatility: Optimized for both Natural Gas (CNG/LNG) and modern Diesel engines.
Nitration Resistance: Resists the high-heat chemical breakdown (nitration) unique to spark-ignited gas engines.
Low-Ash Protection: Prevents valve recession and combustion chamber deposits in high-temp natural gas service.
TBN Retention: Maintains a high reserve alkalinity to neutralize acids over long service intervals.
Sludge Prevention: Keeps the crankcase and valve covers free of performance-robbing deposits.
APPLICATIONS
Municipal transit buses and delivery trucks running on Compressed Natural Gas (CNG).
Mixed fleets where diesel and gas engines share the same maintenance facility.
Stationary natural gas engines used for power generation or pumping.
On-highway heavy-duty trucks requiring a CES 20092 specification.
Licenses & Approvals:
Guardol NG-D is approved for:
Cummins CES 20092
Cummins CES 20086
API CK-4/SN
Guardol NG-D meets the performance requirements of:
Detroit Diesel DFS 93K222
Volvo VDS 4.5
MAMMOTH TECHNICAL TIP:
This is the ultimate "Mixed Fleet" oil. If you’re running a fleet of CNG delivery vans alongside diesel heavy-duty trucks, this eliminates the risk of a technician grabbing the wrong jug. It’s built to survive the extreme combustion temperatures of natural gas without sacrificing the wear protection required for diesel.