* 6.0L Power Stroke V8: This was the most common diesel engine offered that year.
* 7.3L Power Stroke V8: While the 6.0L was becoming more prevalent, some 2004 models might still have had the older 7.3L. It's less common than the 6.0L for that year.
To know for sure which engine is in a *specific* 2004 F-250, you'd need to check the vehicle's documentation (like the owner's manual or the vehicle identification number (VIN) sticker) or look at the engine itself.
