* To locate the oil drain plug on a 2004 Ford Expedition, follow these steps:
* Park your vehicle on a level surface and turn off the engine.
* Lift the hood of the vehicle and locate the oil pan. The oil pan is a metal pan located on the bottom of the engine.
* The oil drain plug is located on the bottom of the oil pan. It is usually a 17mm bolt.
* You may need to use an extension on your wrench to reach the oil drain plug.
* Place an oil drain pan under the oil drain plug to catch the oil.
* Use a wrench to loosen the oil drain plug and allow the oil to drain.
* Once the oil has drained, replace the oil drain plug and tighten it securely.
* Dispose of the old oil properly and add new oil to the engine.
