What kind of oil does a 1999 Ford Expedition use?

A 1999 Ford Expedition's recommended oil type depends on the engine it has. There were a few different engine options available that year. To know for sure, you need to check your owner's manual. It will specify the exact type and weight of oil recommended by Ford.

However, generally, for a 1999 Ford Expedition, you'd be looking at a conventional or synthetic motor oil with a SAE viscosity likely in the 5W-30 or 10W-30 range. Again, consult your owner's manual for the precise recommendation based on your specific engine and climate conditions.