I have something VERY similar, and my dealer can't reproduce it.
On deceleration, or in mild traffic say up to 20MPH, while coasting; it''ll squeal. Like a belt squeal. But it's not constant.
Lightly accelerate, and it goes away. At speed, I don't think it ever happens. Only while under 30MPH or so, usually coasting or idle. I thought on hotter days it was more reproducible, but on cold days it happens too.
While getting other servicing done, the dealer couldn't reproduce it.
It's been going on for 20k miles and more than a year now.
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2012 X5 xDrive35i Sport Activity - Alpine White - M Sport Package
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