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What kind of oil does a 1998 Ford Expedition use?

The recommended oil type for a 1998 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.

However, generally speaking, a 1998 Ford Expedition likely used:

* 5W-30: This was a very common viscosity for that era and likely the most frequently recommended.

Crucially: The owner's manual will specify the *type* of oil (conventional, synthetic blend, or full synthetic) as well as the viscosity. Don't just rely on the viscosity; using the wrong type of oil can damage your engine. Consult your owner's manual or a reputable auto parts store (giving them the engine size will help).