The recommended motor oil for a 2003 Ford Expedition depends on the engine it has. There were several engine options available that year. To know for sure, you need to check your owner's manual. It will specify the weight (e.g., 5W-20, 5W-30) and type (conventional, synthetic blend, or full synthetic) of oil recommended by Ford.
However, generally speaking, a 2003 Ford Expedition would likely use a 5W-20 or 5W-30 motor oil. But again, checking your owner's manual is crucial for accurate information. The manual will also specify the oil capacity for your engine.
