Valvoline Heavy Duty Synthetic Blend 15W-40 Diesel Engine Oil — 2.5 Gallon, API CK-4 Wear Protection

Valvoline Heavy Duty Synthetic Blend 15W-40 is a durable diesel engine oil formulated to protect high-mileage trucks, farm equipment, and on-highway fleets under severe duty cycles.

Engineered for machines that work hard, this 2.5-gallon jug combines synthetic and conventional base stocks with targeted additive technology to resist breakdown, control deposits, and reduce wear. It delivers consistent viscosity and oxidation stability across wide temperatures and is approved or recommended for major diesel makers including Cummins, Volvo, Mack, Ford, Detroit Diesel and Caterpillar.

How does this oil defend engines under heavy loads?

The formula includes a blend of synthetic base oils and advanced additives that create a protective film on critical components, reducing metal-to-metal contact and wear. Laboratory tests show improved wear protection compared with industry-standard oils, helping parts last longer in demanding applications.

• Targeted additive technology for component protection in extreme conditions
• 35% better wear protection vs. industry standard in Cummins ISB test
• Controls deposits and reduces oil breakdown during heavy loads
• Meets API CK-4 and other heavy-duty specifications

Will it perform in high heat and varied climates?

Yes — the synthetic blend improves viscosity stability and oxidation resistance, which extends oil life in high-temperature service and maintains protection in colder starts. That year-round performance makes it suitable for seasonal operations and long-haul routes alike.

• Engineered for extended oil life under high heat
• Maintains viscosity across temperature swings
• Helps prevent thermal breakdown and sludge formation

Is this oil compatible with modern emissions systems and OEM specs?

Valvoline’s 15W-40 synthetic blend is formulated to meet contemporary low-emission engine requirements and a wide range of OEM approvals. It satisfies API CK-4 and earlier categories and carries approvals or recommendations for several major manufacturers, supporting both older and newer diesel platforms.

• Meets/exceeds API CK-4, CJ-4, CI-4 PLUS, CI-4, CH-4, & SN
• Approved/recommended for Cummins CES 20086, Ford WSS-M2C171-F1
• Also compatible with Volvo VDS-4.5, Mack EOS-4.5, Detroit DFS 93K222, Caterpillar ECF-3

How does this container size and format help maintenance routines?

The 2.5-gallon jug strikes a balance between bulk and manageability, making it convenient for shop use, small fleets, or farm owners who need multiple changes without storing large drums. The pour spout and handle design simplify refills and reduce spills during on-site top-ups.

• 2.5-gallon capacity suitable for fleets and workshop use
• Portable, easier to handle than drums for quick service
• Reduces storage footprint while providing multiple refill volumes

Who is this for? Valvoline Heavy Duty Synthetic Blend 15W-40 2.5-gallon is tailored for fleet managers, construction and agricultural operators, owner-operators, and maintenance shops who need a resilient engine oil that balances protection, emissions compatibility, and extended oil life. If your equipment faces heavy towing, continuous operation, or harsh environmental contamination, this formula provides a practical, OEM-backed option to help preserve engine durability while streamlining service operations.