Yes I had this and MANY otehr guys did here too. Hard to explain but it is essentially the pressure from the window pressing against the plastic/rubber linning in the door pillar that essiantlly holds in the window when rolled up.
Take a micro fiber towl, dampen it a bit and run the towl over the part I desrcibed top to bottom. This should take care of any squeaking for 4-6 months until it pops up again. Let me know if that worked for you.
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2009 E90 M3 | Silverstone II | Black Novillo | HRE P40's | Akrapovic Exhaust | Eibach Pro Kit | Jet Black Kidney Grilles | SSII Side Reflectors | SSII Side Gills | LUX H8 Angel Eyes | Macht Schnell Filter | Tecnocraft Envy Charge Pipe
"M3 drivers have no friends." - Jeremy Clarkson
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