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The coldest l have drove the 1M was -6c or +\- 23F and it took forever to get the engine to temperature like 30 mins. You have to keep in mind that your gauge is showing oil temperature which is much more representative of you engine state. My 328d get it engine temperature up to 100c in any temperature up to -10c it does take much more time than my Ford Focus which is showing coolant temperature. For the last week temperature been ranging between -19c and -30c and I can't get the 328d oil above 80c. So if you drive in cold weather you may never reach full working temperature on the engine oil.
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