Thread: odd sounds
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      11-29-2018, 06:15 AM   #26
Realnyc8
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Drives: 2019 M5
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Location: New York

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its the differential fluid. the G4 fluid was out of stock for a while so BMW issued a service bulletin telling dealers to use G3. check to see what fluid was put in your rear diff and have it replaced if it wasnt G4. the worst case is a damaged clutch in the diff
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