The Ford F-250 6.0L Power Stroke diesel engine requires a
high-quality, low-sulfur, CJ-4 rated diesel engine oil. Ford specifically recommends oils meeting this specification. The exact viscosity will depend on your operating temperature. Consult your owner's manual for the recommended viscosity grade (e.g., 15W-40, 5W-40) for your climate.
Don't just look for CJ-4; make sure it also meets Ford's specifications. Using the wrong oil can severely damage this engine. Always check your owner's manual for the most up-to-date and specific recommendations.
