For anyone experiencing squeaking noise on a 2011

[ShantF1]

The squeak is not caused by the window… it's caused by the door frame ( where the rubber on top of the window frame hits the grooves ( insuring an air tight seal)… the problem with this is that BMW has used cheap swade and rubber that gets sticky…the solution is to wax the top of the door frame thoroughly including the rubber on the top of the door. I discovered this as I was washing my car on Friday. I noticed a black rubbery line on the top of the door frame. I cleaned and waxed it and wallla... No more squeaking. As for the tailgate rattle for any X5... Try wrapping it a couple times with the black vinyl tape on the hinges were the bottom tailgate clamps and where the top half meets the bottom half. Please feel free to ask any questions regarding this issue.