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.

SAE 5W-40

Viscosity profiles meet the full requirements for protection and performance. Always consult your owner’s manual for proper oil viscosity and quality selection guidance.



Available in a wide range of packaging including:

Part Number Packaging
52261 Bulk
52262 55 Gallon Drum
52263 330 Gallon Tote
52264 4/1 Gallon Jug Case
52265 6 Gallon Bag-in-a-box
52268 5 Gallon Plastic Pail


The following industry and specific equipment manufacturer standards are approved or suitable for use.

API Approvals: CK-4 (Backwards Compatible), API SN (Gasoline Engines)
OEM Approvals: CAT ECF-3, DDC DFS 93K222 , Ford WSS-M2C171-F1, Mack EOS-4.5, Renault RLD-4, Volvo VDS-4.5
Meets the Performance Requirements of: ACEA E9-16, ACEA E6-12, ACEA E7-12, ACEA E9-12, Cummins CES 20086, Daimler MB228.31, JASO DH-2, MTU Type 2.1

For full product details, please click on the provided PDS sheet.