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THE RUGGED WORKHORSE: FLEET PRO® POWER D®
Proven Reliability. High-TBN Acid Defense.
Mammoth is proud to supply Phillips 66® Fleet Pro Power D, a high-quality engine oil engineered for use in a wide range of on-highway and off-highway diesel engines. Designed to deliver dependable protection in both turbocharged and naturally aspirated engines, Power D is a favorite for fleets requiring a robust, high-TBN lubricant that excels at neutralizing acids and controlling deposits in heavy-duty service environments.
WHY MAMMOTH TRUSTS POWER D:
Robust Acid Neutralization: Features a high Total Base Number (TBN) to effectively neutralize acidic combustion byproducts, protecting engine bearings and yellow metals from corrosive attack.
Soot & Sludge Control: Advanced dispersant chemistry keeps soot particles in suspension and prevents the buildup of sludge, ensuring internal engine cleanliness and consistent oil flow.
Heavy-Duty Wear Protection: Formulated with a proven anti-wear additive package that provides a durable lubricating film on critical components, even under high-load conditions.
Mixed-Fleet Utility: A versatile solution that provides excellent service in older legacy engines while meeting the performance requirements for a variety of construction and agricultural equipment.

PRODUCT RESOURCES
PERFORMANCE
Robust Acid Defense: Features a high TBN to neutralize acids and protect engine bearings from corrosive attack in heavy-duty service.
Soot & Sludge Control: Proven dispersant chemistry keeps soot particles suspended to prevent oil thickening and maintain internal cleanliness.
Heavy-Duty Reliability: A versatile workhorse for mixed fleets, providing dependable protection for both on-highway and off-highway engines.
PROTECTION
Heavy-Duty Film Strength: Creates a massive physical barrier between moving parts that refuses to shear or break down under pressure.
Reliable Oil Pressure: Maintains consistent oil pressure in high-hour engines, ensuring every part of the engine is properly lubricated.
Engine Cleanliness: Robust detergent package scrubs away existing deposits and prevents new ones from forming.
UPTIME
Battle-Tested Reliability: A proven formula that has kept heavy equipment running for decades, giving you peace of mind in the most remote job sites.
Broad Engine Utility: Simplifies maintenance for older fleets and off-road equipment, ensuring the right oil is always on hand for every machine.
Seal Integrity: Formulated to be gentle on gaskets and seals, reducing the annoying leaks and drips that lead to low-oil warnings.
COMPOSITION
RESISTANCE
PROTECTION
FEATURES & BENEFITS
Universal Protection: A high-tier "Classic" fleet oil for a wide variety of diesel and gasoline engines.
Film Strength (15W-50): The extra "body" of the 15W-50 grade provides massive protection for hard-working, older iron.
Oil Pressure Stability: Helps maintain consistent oil pressure in high-hour engines during peak summer heat.
Soot Management: Robust additive package keeps soot particles small to prevent abrasive engine wear.
Corrosion Shield: Protects internal engine metals during periods of seasonal or intermittent use.
APPLICATIONS
Older on-highway and off-highway diesel engines (Pre-2007).
Heavy-duty construction equipment (Excavators, Dozers, Loaders).
Agricultural equipment and stationary diesel power units.
Mixed fleets requiring a high-viscosity oil for severe high-load operation.
Licenses & Approvals:
Fleet Pro Power D is licensed or OEM-certified for:
API Service CK-4, CJ-4, CI-4 PLUS
Cummins CES 20086
Mack EOS-4.5
Volvo VDS-4.5
Fleet Pro Power D meets or exceeds the requirements of:
Caterpillar ECF-3, ECF-2
ACEA E9
Allison C-4 (where applicable)
MAMMOTH TECHNICAL TIP:
This is the oil we recommend for older heavy equipment working hard in the heat. When you’re pushing a machine to its limit on a job site in mid-August, that 15W-50 grade provides the extra cushion needed to maintain oil pressure and prevent metal-to-metal contact when things get hot.
