crwdns2934241:0crwdne2934241:0 L Pfaff

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pythagorasgp ,  This is what a lot of the BMW forums are saying, Very common issue, the culprit is usually a leaking check valve. I also found a good link for you to read through that goes in depth of the issue even from earlier models.

http://www.e90post.com/forums/showthread.php?t=589753

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open