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      07-14-2012, 05:11 PM   #5
F104
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Belgium
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Drives: E92 320D M-sport
Join Date: Apr 2008
Location: belgium

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the top covers are only plastic with a simple seal. They are not going to 100% resist changes in atmospheric pressure. Imagine driving up to the ski resorts in the alps, air within the headlights will get out, and will get back in when you drive back down.
As said, either covered garage or park in in the sun with covers off, hood open. If you're in a hurry, the wife's hair dryer works really good