* 4.8L V8: This was a common engine choice.
* 5.3L V8: Also a frequently available engine.
* 6.0L V8: This was a larger, more powerful option, often found in higher trim levels or optional packages.
To know the exact engine size of a specific 2003 GMC Yukon XL, you'll need to check the vehicle's documentation (like the owner's manual or the sticker on the driver's side doorjamb) or its Vehicle Identification Number (VIN).