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      11-10-2012, 11:37 AM   #2
First Lieutenant
Drives: 335i Cabrio
Join Date: Sep 2012
Location: Atlanta

Posts: 393
iTrader: (0)

I'd check the oil for milkiness and keep an eye on the coolant level. Could also be a pinhole leak that only occurs at high temps or something. Do you have any coolant smell in the cabin and/or a higher amount of filming on the inside glass?

Tough to figure out the cause unless you can find where the coolant is going.
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