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My M40i is 22 months old with 8,000 miles on the clock and I noticed a high-pitched whine at all speeds about a year ago. At that point it was very faint and not all that noticeable most of the time so I dismissed it as background exhaust drone.
The noise has become more noticeable in recent weeks, so when it was in for service I had them look at it. Seems the diff seals have gone, which at low miles on a $63K car is not good enough.....
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