Warm up time can be quite varied according to ambient temperature. I note a much slower heat up cycle in my N55 (535i) engine as the temperature drops below freezing. Oil is not up to my 'normal' range of 105 - 110C, (220 - 230F), even after 12 miles driving on open roads at around the freezing point. May only be 90C (195F). At something like -4C (25F) oil temperature needle only starts moving off the stop, (70C/160F), after about 7 - 8 miles.
When we monitor oil temperature, dropping to sub freezing temperatures really shows a slow warm up.
I find the same as F30ed, coolant is just a few degrees ahead of the oil temperature in the N55 engine, during the warm up phase.
Quote:
Originally Posted by F30ed
I was monitoring coolant/oil temps on both N20 and N55 in current Chicago weather. Oil temp just a few degrees lower than coolant. So if Oil shows 70, than coolant is probably around 75...
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As heat management and working parameters are very similar in the N20/26 and N55 engines, we expect similar oil/coolant variations.
I'm also used to diesel engines and oil temperature can be 'miles' behind coolant, in the warm up phase. In sub freezing temperatures oil temperature can drop as engine load is eased off, even after 12 or more miles of driving.