15W40 Diesel Oil 1 Quart

The 15W40 Diesel Oil 1 Quart from REDLINE OIL is a premium synthetic diesel engine lubricant designed for serious operators who demand maximum engine protection and performance in heavy-duty applications. Whether you're running a pickup truck, work vehicle, or stationary diesel power plant, this single-quart container provides the viscosity stability and anti-wear chemistry that keeps modern diesel engines running clean and efficient under demanding loads. Redline's formulation addresses the unique challenges diesel engines face—higher compression ratios, soot accumulation, and extreme operating temperatures—making it the choice for mechanics and fleet managers who refuse compromise on engine longevity.

A 15W40 viscosity rating means this oil flows like a 15-weight oil at cold startup, ensuring faster engine cranking and better piston ring sealing in winter conditions, while maintaining the protective film strength of a 40-weight oil at operating temperature. Redline's advanced additive package includes zinc and phosphorus anti-wear agents that reduce valve train wear and ring scuffing—critical in turbocharged diesel engines where pressures exceed 2,000 psi. The synthetic base stock resists oxidation better than conventional mineral oils, extending drain intervals and reducing acid buildup that corrodes bearing surfaces and cylinder walls. This formulation also incorporates enhanced detergency to suspend fuel soot particles, preventing them from forming sludge deposits in the crankcase.

Diesel mechanics and engine builders trust Redline for engines operating above stock power levels, including those with performance injectors, turbocharger upgrades, or extended intervals. The 1-quart container is ideal for topping off between services, maintaining proper oil level after filter changes, or stocking fleet maintenance bays where consistency across multiple vehicles matters. This product meets or exceeds API CK-4 and ACEA E7 specifications, ensuring compatibility with both older indirect-injection diesels and modern common-rail engines from Ford, Chevrolet, Dodge, and other manufacturers. Always verify your engine's original equipment manufacturer recommendations before switching oil types, and maintain proper intervals for maximum engine life.