Once you know the engine size, look for the following information in your owner's manual or on the oil fill cap:
* Oil type: Likely to be 5W-20 or 5W-30. The manual will specify the correct viscosity for your climate and driving conditions. Using the wrong viscosity can damage your engine.
* Oil certification: Look for an API certification (e.g., API SN, SM, SL). Newer certifications generally mean better performance and protection.
Without knowing your engine size, I cannot give you a definitive answer. Using the wrong oil can seriously damage your engine. Always consult your owner's manual.
If you don't have the owner's manual, you can often find a PDF version online by searching "[Year] Ford Expedition Owner's Manual" on Google. You can also check the engine bay - there should be a sticker indicating engine size and recommended oil.
