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What type of oil goes into a 99 ford expodition?

The recommended oil type for a 1999 Ford Expedition depends on the engine it has. Ford Expeditions of that year came with either a 4.6L V8 or a 5.4L V8. The owner's manual is the best source for this information.

However, generally speaking, a 5W-30 oil meeting the specifications API-certified SL or SM (or newer certifications like SN, SN Plus, SP, etc.) would be appropriate for both engines. Consult your owner's manual to confirm the exact viscosity and API certification recommended by Ford for your specific Expedition's engine. Using the wrong oil can damage your engine.