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Old 09-27-2012, 12:18 PM
anE934fun anE934fun is offline
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Location: S.F. Bay Area
 
Join Date: May 2008
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Mein Auto: 2010 335d
Quote:
Originally Posted by Zeichen311 View Post
The same is true for door frame seals and trunk seals. All spend a lot more time closed than open--even more so than the top. Given regular care, none of those collapse from spending more time crushed than expanded. The top seals should be no different: Opening the top periodically to lubricate/protect the seals should be more than sufficient to keep them from taking a "set."
Quote:
Originally Posted by fun2drive View Post
BMW uses rubber gaskets not synthetic. Evenually they will shrink and there is nothing you can do about it but keep the seals plyable. I have had a number of BMW convertibles and each and every one will eventually leak from the front seal to the windshield from the rubber shrinking.
This can take a long time however and I think the sun beating down on the rubber accelerates that process because I have never replaced seals that were protected by the sun. I don't think keeping the top closed in the garage is going to hurt anything actually. Better to have the top down then in some popped up where the load on the hinges and hydraulics is there for however long you leave it in the garage...
Two separate concepts on the same issue. It would be really nice for BMW to provide guidance. Until then, it is probably best practice to keep the seals 'conditioned' (even for E90/1/2 cars).
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