Valvoline Heavy Duty Full Synthetic 15W-40 Diesel Engine

Valvoline Heavy Duty Full Synthetic 15W-40 is a fully synthetic diesel engine oil designed to protect heavy-duty engines from wear, deposits, and oil breakdown across extreme temperatures and demanding duty cycles.

This full synthetic 15W-40 diesel oil is engineered for heavy equipment, on-highway trucks and agricultural machinery that face severe operating conditions. Formulated with advanced base stocks and targeted additives, it delivers enhanced viscosity control, oxidation stability and extended drain potential while meeting multiple OEM and industry specifications. Whether you run a mixed fleet or maintain high-hour construction gear, this product is built to extend component life and support low-emission systems.

How does this oil protect engines under heavy load?

Valvoline’s formulation focuses on reducing metal-to-metal contact and slowing deposit formation during intense duty cycles. The additive package includes anti-wear agents, detergents and dispersants that stabilize oil under high temperature and soot-loading conditions.

• Proven 35% reduction in valve train wear in Cummins ISB testing
• Detergent chemistry controls deposits for cleaner pistons and rings
• Oxidation inhibitors maintain film strength at elevated temperatures

Will it extend oil life and service intervals?

The full synthetic base oils and enhanced oxidation stability help the oil resist breakdown, allowing for longer effective drain intervals compared with many industry-standard products. Field and engine bench tests show measurable improvements in oil longevity.

• Up to 28% longer oil life in Volvo T-13 engine testing versus industry norms
• Better thermal and shear stability preserves viscosity over time
• Helps reduce sludge and varnish accumulation that shortens oil life

Which engines and OEM approvals does it support?

This 15W-40 meets a broad set of specifications and is suitable for many modern and legacy diesel engines. It’s formulated to be compatible with common aftertreatment and emission systems when used per manufacturer guidance.

• API CK-4, CJ-4, CI-4 PLUS, CI-4, CH-4 and SN compliant
• Recommended or approved for Cummins CES 20086, Volvo VDS-4.5, Mack EOS-4.5
• Also meets Detroit Diesel DFS 93K222, Caterpillar ECF-3, Ford WSS-M2C171-F1

How does it perform in different climates and operating conditions?

The 15W-40 viscosity grade provides reliable start-up flow and protective film strength across a wide temperature range. Its formulation offers year-round performance so equipment can remain protected through heat, cold and variable workloads.

• 15W low-temperature flow for easier cold starts and lubrication
• Stable high-temperature viscosity to protect under sustained heavy load
• Designed for construction, fleet, agricultural and mixed-use equipment

Who is this for: Operators, fleet managers and maintenance professionals who need a resilient, multi-specification diesel engine oil that balances wear protection, deposit control and extended service life. Ideal for mixed fleets and heavy-duty equipment where OEM compatibility, year-round performance and longer oil life reduce downtime and lower lifecycle costs.