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I'm on my third one of that rubber molding on top of windshield..I also have a 2006 325i.
First molding replaced at 46,000 miles..replaced again at 93,000 miles. First was replaced under warranty second one cost in the $100 to $200 range if I recall.
Possible reasons for short lifespan:
Car is stored outside in the sun.
That rubber has absolutely no protection from UV because of where it lays.
There must be high wind pressure on it when moving at highways speeds.
I used to wash the car in a touchless car wash that uses high water pressure spray.
Windshield wiper fluid is squirted up onto this rubber possibly damaging it.
Rain and other flying particles routinely strike it.
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