wow, this is still an issue?!
if it's any consolation, we were probably the first people to trade out of our vibrating F30...we got into a 2013 X3 xDrive28 and experience the same thing. :-\
[2007 E93 335i 6AT | Crimson Red/Black Dakota | Premium | Sport | Heated Seats | iPod/USB | JB+ | 15% Tint | AngeliBright LED Halos]