* 6.8L V10: This engine typically calls for conventional oil, often SAE 5W-30 or 10W-30. Check your owner's manual for the exact specifications, as it might specify a certain viscosity based on temperature.
* 7.3L Power Stroke Diesel: This diesel engine requires a diesel-rated oil, typically a 15W-40 CF-rated oil (or higher, like CG-2). Again, consult your owner's manual for the precise specifications.
Crucially: Always check your owner's manual for the exact oil type and viscosity recommended for your specific 2001 Ford Excursion engine. The information on the oil fill cap may also provide guidance, but the owner's manual is the definitive source. Using the wrong type of oil can damage your engine.