haasman,
fix for bushings was not cheap, $500, yikes!!! mostly labor.
-mike

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1995 MB E320 Wagon
2001 BMW 530i
2007 MINI Cooper S (!)

Hi there,
Your comment that the noise disappears with a car wash makes me suspect a squeak at the rear window glass between the rubber molding and the glass. Try dowsing the molding to glass joint with some silicone spray, and if it makes the noise go away, have the molding replaced.
Richard Wooldridge
'82 300D/4.3L V6
Etc...

Thanks, Richard, I have that in mind also, hmmm....

__________________
1995 MB E320 Wagon
2001 BMW 530i
2007 MINI Cooper S (!)