Window Regulator. X5s eat these things...i had to replace all 4 on my last X all within 3 weeks time...at least german design is consistant i guess lol

they are very "plasticy" and wear.

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-Fred
1994 BMW 325i (sold)
1998 BMW 318i (sold)
2002 BMW X5 3.0 (sold)
2006 BMW X5 4.4 Alpine White