Reliant FS engine oils have been specifically formulated to meet today’s heavy-duty diesel OEM (Original Equipment Manufacturer) requirements and stringent API Commercial Category CK-4 specifications. Blended with state-of-the-art, technologically advanced additives and superior quality synthetic base oils, Reliant FS engine oils surpass the higher performance demands of model year 2017 and newer heavy-duty diesel engine hardware. The API Commercial Category CK-4 offers backwards compatibility for older diesel engines requiring older, obsolete Commercial classifications including CJ-4, CI-4 Plus, CI-4 and CH-4. D-A Reliant FS engine oils promote robust engine cleanliness and protects against deposit formation.

Reliant Full Synthetic engine oils promote robust engine cleanliness and protects against deposit formation. They also guard against viscosity increase by affording superior thermal / oxidation stability under extreme temperature ‘severe service’ (duty) operation. and effectively minimize harmful oxidative conditions
Maintains film strength and shear stability throughout intended service, equating to longer, more pronounced service drain intervals.
Provides outstanding pumpability / flowability in extreme cold ambient environments.
Affords significant alkalinity or higher Total Base Number to maximize acid neutralization and prevent harmful component corrosion.
Size - 5 Gallon Pail

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Reliant FS 5W40 Heavy Duty - 5 Gallon