The recommended oil type for a 7.3L Power Stroke diesel engine depends on the year of the truck and the specific operating conditions. However, generally speaking, it requires a
high-quality diesel engine oil that meets the specifications set by Ford. This typically means a
CJ-4 or
CI-4 rated oil (with CJ-4 being preferred for newer models), although some older models might accept CH-4.
Always check your owner's manual for the *exact* oil type and viscosity recommended by Ford for your specific year and model of truck. The viscosity will usually be something like 15W-40, but this can vary depending on temperature. Using the incorrect oil can severely damage the engine.
