Quote:
Originally Posted by Stohlen
if it was -30, its because it was so cold. The engine isn't really build to operate properly at those conditions. If you frequent that kinda temp you should purchase an engine block heater, otherwise you're asking for trouble. I'm kinda surprised your coolant didnt freeze.
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As long as the battery is in good shape, -30 is not a problem with a BMW without a block heater. In Canada there was a recall a couple of years ago to upgrade the battery from 70Ah 570CCA to 90Ah 720CCA on the 135i. Our 135i has started at -35°C without a problem.
You can't fit a standard block heater in most current BMWs due to a lack of frost plugs that can be removed, so an in-line coolant heater together with a battery blanket is the easiest solution if the temperature is below -35°C.
The standard BMW coolant 50/50 mix is good down to -37°C.