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This is a well known problem on some BMWs and I had it on my wife's X3. The issue is caused by silicone and some waxes on the door flocking and mating door opening. Avoid getting your car waxed at an automatic car wash if you use one. Just get a plain wash and hand wax your car. If you have creaking, clean the door seal (mainly the flocking) and the door opening with 3M adhesive remover (available from an auto parts store) then coat the the surfaces with Carbaflo Sliding Lubricant KSP 105, available from the parts counter at your BMW dealership (P/N 83 23 0 309 627). It's expensive, but worth it. I haven't had a reoccurrence in over a year following this procedure. I've read that Gummipfledge contains silicone and BMW doesn't carry it or recommend it any more.
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