Quote:
Originally Posted by aerobod
The standard BMW coolant 50/50 mix is good down to -37°C.
|
I wouldn't trust a coolant rating enough to risk it below -20. Its real easy for the coolant to be contaminated or improperly mixed during a service and for the coolant to freeze. I'd just rather not risk that. Engines dont like extreme cold, the engine components shrink when cold, and that essentially makes your engine out of tolerance. I'd rather not run it like that if at all possible. If you regularly see temps that low, you should really keep it warm in some manner before starting.