Triax 15W-40 API CK-4 Full Synthetic Diesel Engine Oil — 1 Gallon, Friction-Modified for Extended Drains & Wear Protection

Triax Fleet Supreme 15W-40 API CK-4 is a full-synthetic, friction-modified heavy-duty diesel engine oil engineered for extended drains, reduced wear, and improved fuel economy.

Built for modern diesel pickups, semis, and fleet trucks, Triax Fleet Supreme blends Nano-Boron and molybdenum friction modifiers into a CK-4 formulation to deliver high shear stability, strong film strength, and enhanced cold-start performance down to -45°F. This 1-gallon option is optimized for owners who want longer drain intervals, quieter operation, and protection under towing and hauling conditions without switching base oil types or additives between services.

How does Triax Fleet Supreme protect engines under heavy loads?

The friction-modified formula lowers internal friction and builds a resilient lubricating film that resists shear and metal-to-metal contact during severe service. That film strength helps maintain viscosity and reduces wear during sustained high-temperature and high-torque operation.

• Nano-Boron and moly additives reduce friction for up to 48% lower wear versus common standards.
• High shear stability preserves viscosity under stress for consistent lubrication.
• Designed for towing, hauling, and extended high-RPM duty cycles in diesel engines.

Can it extend service intervals for pickups and highway trucks?

Yes — Triax Fleet Supreme is formulated for extended drain capability while meeting API CK-4 performance. Under recommended operating conditions you can expect significantly longer drain intervals compared with conventional heavy-duty oils, when used with proper maintenance monitoring.

• Suitable for extended intervals: marketed for >100,000 miles on highway semis and up to 30,000 miles on Super Duty pickups in compatible applications.
• Maintains contaminant-suspension and dispersancy needed for longer service life.
• Best used with oil analysis and OEM service recommendations to maximize safety and performance.

Will it work in my Ford, Chevy, Dodge, or GMC diesel?

Triax Fleet Supreme is API CK-4 compliant and formulated to be compatible with common heavy-duty diesel engines, including Ford Powerstroke, Chevy/GMC Duramax, and Dodge/RAM Cummins platforms. It supports the lubrication needs of modern engine designs while meeting industry protection benchmarks.

• Full compatibility across major diesel pickup and heavy-duty truck engines.
• Designed to integrate with existing seals and components used in these platforms.
• Use per OEM viscosity and drain interval guidance for specific models.

How does it improve drivability and cold starts?

The low-temperature properties and friction modifiers aid faster turbo spool-up, smoother operation, and improved cold-start cranking at very low ambient temperatures. Those traits contribute to quieter idle behavior and better responsiveness right after start-up.

• Rated for effective cold starts down to -45°F for reliable winter performance.
• Friction modifiers enhance turbo response and reduce start-up wear.
• Lower operating temperature contributes to quieter and more efficient running.

Who is this for? Triax Fleet Supreme 15W-40 is aimed at fleet managers, owner-operators, and pickup owners who demand long drains, strong wear protection, and improved fuel-efficiency benefits without sacrificing compatibility. It is particularly appropriate for heavy-duty diesel trucks used in towing, long-haul highway service, or severe-duty applications where extended service intervals and high shear stability matter. Always follow your vehicle manufacturer’s viscosity and service recommendations and consider oil analysis when extending drain intervals.