The recommended oil for a Dodge 6.7 Cummins depends on the specific year and operating conditions, but generally, it requires
CJ-4 rated diesel engine oil. Always check your owner's manual for the exact specifications, as the recommended viscosity grade (like 15W-40 or 5W-40) and other specifics may vary.
While CJ-4 is the standard, some newer models might even specify a CK-4 oil. Again, consult your owner's manual for the definitive answer. Using the wrong oil can severely damage your engine.
