Thank you for the reply. I'm not getting too worked up about it at this point. I am new to owning a diesel but I'm aware of the their peculiarities to some extent. I will wait until more moderate ambient temperatures and then try a similar run again to see what changes.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim