{"product_id":"triax-15w-40-api-ck-4-full-synthetic-diesel-engine-oil-1-gallon-friction-modified-for-extended-drains-wear-protection","title":"Triax 15W-40 API CK-4 Full Synthetic Diesel Engine Oil — 1 Gallon, Friction-Modified for Extended Drains \u0026 Wear Protection","description":"\u003cp\u003e\u003cstrong\u003eTriax 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.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt 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.\u003c\/p\u003e\n\n\u003ch3\u003eHow does Triax Fleet Supreme protect engines under heavy loads?\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNano-Boron and moly additives reduce friction for up to 48% lower wear versus common standards.\u003c\/li\u003e\n  \u003cli\u003eHigh shear stability preserves viscosity under stress for consistent lubrication.\u003c\/li\u003e\n  \u003cli\u003eDesigned for towing, hauling, and extended high-RPM duty cycles in diesel engines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan it extend service intervals for pickups and highway trucks?\u003c\/h3\u003e\n\u003cp\u003eYes — 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSuitable for extended intervals: marketed for \u0026gt;100,000 miles on highway semis and up to 30,000 miles on Super Duty pickups in compatible applications.\u003c\/li\u003e\n  \u003cli\u003eMaintains contaminant-suspension and dispersancy needed for longer service life.\u003c\/li\u003e\n  \u003cli\u003eBest used with oil analysis and OEM service recommendations to maximize safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it work in my Ford, Chevy, Dodge, or GMC diesel?\u003c\/h3\u003e\n\u003cp\u003eTriax 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFull compatibility across major diesel pickup and heavy-duty truck engines.\u003c\/li\u003e\n  \u003cli\u003eDesigned to integrate with existing seals and components used in these platforms.\u003c\/li\u003e\n  \u003cli\u003eUse per OEM viscosity and drain interval guidance for specific models.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does it improve drivability and cold starts?\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRated for effective cold starts down to -45°F for reliable winter performance.\u003c\/li\u003e\n  \u003cli\u003eFriction modifiers enhance turbo response and reduce start-up wear.\u003c\/li\u003e\n  \u003cli\u003eLower operating temperature contributes to quieter and more efficient running.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho 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.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is Triax Fleet Supreme compatible with OEM diesel engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It meets API CK-4 standards and is compatible with Ford, Chevy, Dodge, GMC heavy-duty diesel engines when used at recommended viscosity and intervals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I extend oil change intervals with this oil?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Potentially — the formula supports extended drains, but always confirm with OEM guidance and use oil analysis to safely extend intervals.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Triax","offers":[{"title":"Default Title","offer_id":55168586318167,"sku":"B07MMYN4WH","price":79.43,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/triax-fleet-supreme-front-gallon.jpg?v=1790409225","url":"https:\/\/britishgarage.co.uk\/products\/triax-15w-40-api-ck-4-full-synthetic-diesel-engine-oil-1-gallon-friction-modified-for-extended-drains-wear-protection","provider":"British Garage","version":"1.0","type":"link"}