You cannot simply get a single recommendation without knowing the specifics of your Expedition.
To find the correct spark plugs, you should:
1. Locate your owner's manual: This is the best source of information. It will specify the exact type of spark plug recommended by Ford for your specific vehicle.
2. Check the sticker under the hood: Often, a sticker under the hood will list recommended fluids and maintenance items, including spark plugs.
3. Use an online parts lookup tool: Websites like AutoZone, Advance Auto Parts, or RockAuto allow you to enter your vehicle's Year, Make, Model, and Engine to find the correct parts.
4. Consult a Ford dealer: A Ford dealership service department can definitively tell you the correct spark plugs for your Expedition.
Providing your Expedition's year and engine will allow me or others to potentially offer a more specific suggestion, but using the methods above is crucial to ensure you get the correct spark plugs for your vehicle. Using the wrong spark plugs can lead to misfires, poor performance, and engine damage.