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What weight motor oil does 1999 f-150 5.4 need?

The recommended weight of motor oil for a 1999 Ford F-150 with a 5.4L engine depends on the climate where you live. Consult your owner's manual for the most accurate information.

However, generally, a 5W-30 is a common and often recommended weight for this engine and year. In extremely hot climates, a 10W-30 might be appropriate, while in extremely cold climates, a 5W-20 might be considered, but again, check your owner's manual. Using the incorrect weight can negatively impact your engine's performance and longevity.