If rolled up completely, the windows should hold a seal against a normal car wash. I've never seen a drop come through. Driving on the highway during a storm isn't going to be all that better and BMW does not design its doors so it only leaks "a little". I'd make sure you're buttoned up tight next time and then watch carefully.
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135i, SGM, Coral, Sport Package, Auto, Premium Hifi, USB/ipod, Apex EC-7s, PPK Stage II
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