Keep your engines running strong with Boss Lubricants Xtreme 15W40 Synthetic Blend Diesel Engine Oil. Designed for heavy-duty diesel engines, this premium CK-4 oil offers excellent wear protection, high oxidation stability, and superior sludge control.

Formulated with Group III base oils and an advanced additive system, Boss 15W40 ensures reliable performance in severe operating conditions while extending engine life. Perfect for fleets, construction equipment, agriculture machinery, and highway trucks.

✅ Key Benefits:

• Meets or exceeds API CK-4, CJ-4, CI-4, CH-4

• Superior sludge and varnish protection

• Thermal stability & high oxidation resistance

• Excellent low temperature flow for cold starts

• Protects against wear, deposits, and corrosion

• Designed for modern emission control systems (EGR, DPF, SCR)

Specifications (15W40):

• Density @ 15°C: 0.879 kg/L

• Kinematic Viscosity @ 40°C: 118 cSt

• Kinematic Viscosity @ 100°C: 15.7 cSt

• Viscosity Index: 140

• Flash Point: 232°C

• Pour Point: -33°C

• TBN: 10

• Ash Sulphate: 0.99%

OEM Approvals / Meets Requirements:

• Caterpillar: ECF-3 / ECF-1

• Volvo: VDS-4.5/4/3/2

• Mercedes-Benz: 228.31, 228.3

• MAN: M-3575, 3275

• Cummins: 20086, 20081, 20071, 20072, 20076, 20077, 20078

• Detroit Diesel: 93K222/228/15/14

• Ford: WSS-M2C171-F1

• Renault: RLD-4, RLD-3

• Allison: C-4/3

• Global DHD-1

• JASO DH-2

Package Size:

• 20 Liter Pail