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Q: Rear End Differential Fluid

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Today I had my Mercury Grand Marquis serviced by a local mechanic. The mechanic suggested that the rear end differential fluid needed to be replaced. The owner's manual states that the rear end differential fluid never needs to be replaced. Which is correct? Thanks

My car has 83000 miles.
My car has an automatic transmission.

You should only have the differential serviced when you have a leak on the rear cover or an axle seal has leaked and needs replaced. The gear lube should not need replacement unless a problem is present.

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