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#1
04-18-2009, 03:57 PM
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Rear Diff. fluid
On a 2004 Mercury Grand Marquis did the factory install synthetic oil in the rear diff. when the car was manufactured and when should it be changed under light load use?
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#2
04-19-2009, 05:37 PM
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Re: Rear Diff. fluid
The 2004 had a semi-synthetic grease in it from the factory.. The grease should last at least 100k miles. I think Ford recommends changing it at 60k though. It never hurts to change it out. If you have driven through high water, you should change it anyway.
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