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I've recently started to hear a similar noise on my 335D here and there..
I'm not sure how else to describe it but it sounds the same as when you shake a blown light bulb and the element inside rattles.. You get a very gentle weird hissing noise like when two thin bits of metal are twangngin together..
It's a weird sound from a car and it doesn't vary with speed..
If I take her to BMW, I can guarantee the noise will not be noticeable...
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