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My 2011 Z4 30i has the same problem. It was ordered in Jan and delivered March 30.
As with yours, it did not make the noise for a few weeks.
I've noticed that with mine once the gas tank gets below 1/2 full the noise disappears.
It is really irritating and I've asked the service dept. about it. They told me a BMW rep needs to visit and approve the repair.
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