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Old 12-22-2009, 07:17 PM
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ProfessorCook ProfessorCook is offline
Not a real doctor.
Location: Massachusetts
 
Join Date: Jan 2009
Posts: 5,648
Mein Auto: 2009 328i Coupe
'Last time I stopped by the dealer, they were still selling both sets of caps: metal and plastic. They look the same, but the plastic ones, of course, feel much lighter and won't cause a problem.

To get the corrosion you need metals that are rather far apart on the galvanic series (http://en.wikipedia.org/wiki/Galvanic_series) and water. Pure water is a lousy electrolyte. Dissolve a salt in it, and you're good to go. But there are plenty of other impurities that can make water a better conductor and accelerate corrosion. So... even if you're in an area that never salts the roads (lucky you), I'd still be wary about the whole valve cover thing.

And, btw, I had a flat recently. The RFT didn't look flat at all (naturally). Really. How hard is it to check tire pressures?
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'09 328i Coupe: MT, Monaco Blue, Black Dakota, Dark Burl, ZPP, ZSP, ZCW, CA, Logic7, HD Radio, IPod
Ordered: 14Jan09; Delivered: 24Feb09 from Stratham, NH BMW
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