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What type of oil to use in 1998 Ford Expedition?

The recommended oil type for a 1998 Ford Expedition depends on the engine it has. There were several engine options available that year. To determine the correct oil, you must check your owner's manual.

However, generally speaking, 1998 Ford Expeditions likely used either 5W-30 or 10W-30 conventional or synthetic motor oil. The owner's manual will specify the weight and whether conventional or synthetic is recommended. It will also specify the API service classification (e.g., SF, SG, SH, SJ etc. - older Expeditions might specify an older classification). Ignoring the owner's manual could damage your engine.

To find the correct information:

1. Locate your owner's manual. This is the most reliable source of information.

2. Look for the section on engine oil. It will specify the recommended oil weight and type.

3. Check the oil fill cap. Sometimes the recommended oil type is printed on the oil fill cap. This is secondary to the owner's manual.

If you cannot locate your owner's manual, you can try searching online for a digital copy specific to your Expedition's year and engine. You can also consult a Ford dealership or a trusted auto parts store. They can help you identify the correct oil for your vehicle based on the Vehicle Identification Number (VIN).