I've been loving my new 95 540i M Sport. Just drove about 250 miles this weekend and the things just eats up pavement. Gas too, but what the hell. Anyway, I've got a sqeaky rattle sound from either the rear of drivers side front or front of driver's side rear door. I lubricated all rubber parts with Gummipfledge but that didn't help (was kind of fun though). Sound seems like it could be coming from the seat belt mechanism. Any ideas one what could be causing this?