I have had problems with a water leak by the middle of the windows every since I purchased my 2000 z3 brand new. I have taken it to Kelly BMW in Columbus, Ohio for service and at first they kept telling me that it was BMW exceptable and then my car started smelling like mold/mildew, they replaced the seals saying do to leakage. It still leaks and still smells. I now have an attorney and I heard that on the z4 they changed the seals around the windows so they are doulbe now...Any information on this would greatly appreciated. thanks