* 4.8L V8: This was a common engine choice.
* 5.3L V8: Also a frequently available engine.
* 6.0L V8: This larger engine was an option, often in higher trim levels or as an upgrade.
To know the exact engine size of a specific 2003 GMC Yukon, you'll need to check the vehicle's documentation (owner's manual, vehicle identification number (VIN) decoder) or the sticker located in the driver's side doorjamb.