However, generally, 15W-40 is a common and often recommended viscosity for these engines, especially in warmer climates. Some owners prefer using a CJ-4 rated oil, which is designed for modern diesel engines and meets stringent emissions requirements. Others may use a CH-4 rated oil, which was the previous standard.
Crucially: Always consult your owner's manual. The manual will specify the recommended oil viscosity and API certification (like CJ-4 or CH-4) for your specific year and model of truck. Using the incorrect oil can severely damage your engine.
Factors influencing oil choice include:
* Climate: Thinner oils (like 5W-40 or even 0W-40) might be beneficial in extremely cold climates to ensure easier starting. Thicker oils are better suited for hot climates.
* Engine modifications: Modifications might necessitate a different oil type or viscosity.
* Driving conditions: Severe conditions (heavy towing, extreme temperatures) might warrant a higher quality or different viscosity oil.
Don't rely on generalized advice; check your owner's manual. This is the most reliable source for the correct oil specification for your 7.3L Power Stroke.
