California M3 survival in Chicago's winter
Recently moved to Chicago with my E46 M3. Got my oil change at an indie BMW repair shop. As I was leaving, the owner of the shop recommended me to have the coolant/antifreeze ratio changed because the harsh winter could freeze the coolant I have in the car now. He recommended this because I just moved from California. Does this sound accurate?
I was quoted around $190 for the job, which seems a little high, but it was $100 for the oil change (which is a relatively fair price).
Any tips/recommendations to prepare my car for the snow would be appreciated