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      09-21-2012, 01:19 PM   #11
tuco44
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Drives: 2012 E91 328iTouringxDrive BSM
Join Date: Apr 2007
Location: Western Canada

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It is oil temp, so 10 miles or 10-15 mins is not unreasonable, and it depends a bit on outside temps.

It is better to warm up an engine under gentle driving than idling. This is not new nor limited to BMWs.
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2012 328iTouring xDrive Black Sapphire

Waiting for: 2016 340i xDrive MPerf. EBII

Previous BMWs - 17 others since 1971.