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      11-10-2012, 03:12 PM   #4
Second Lieutenant
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Drives: 2016 M235i xDrive
Join Date: Mar 2006
Location: NW Chicago Land

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Originally Posted by gpb View Post
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.
I think I'll get an oil change and to a Blackstone analysis. I'll be able to see the condition of the oil and Blackstone will show if any antifreeze is in there.

No smell. No abnormal filming (always some in any car with plastics).