I also bent the front track SLIGHTLY so the window aligns better. Do this last after everything else. You'll need to run the window up and down to test it. If you bend it incorrectly you'll hear the window bind. Small bends make a big difference. My windows move so freely now there's no need for lube. I was able to wipe the rubber clean and it's plenty slippery without any lube.
Current caretaker of The elusive 2001 "Pearl White" VX - The last one.
1988 BMW 325ic
Pic of the front window track.
Can see scratch marks where I used pliers to widen it. I also angled it slightly just as ahdoman mentions above.
All this was written up by "Phines" several years ago. He had pics as well.
It relieves/reduces the friction between the glass edge and the rubber molding the glass fits into, so it won't bind/"pinch" and slow down the upward movement of the glass.
Many owners have had the window MOTOR burn out after years of it trying to raise the glass against this friction.
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VX KAT
....the adventure BEGINS ANEW! ...2015......
Remember that life is not measured in the breaths you take, but rather in the moments that take your breath away.
Thanks, VX KAT. Guess one benefit of having a late blooming windows problem is there's a ton of info about possible fixes.