I have a 2005, 6-Speed, M3 Coupe that I bought in April. So far I've put on about 5000 miles. Here in Northern Illinois was the first day it saw 0 deg. (F) temperatures.
With the three other BMW's I've owned once the engine coolant reached operating temperature the temp gauge remained straight up, never wavering even the slightest, regardless of the outside temp or the traffic conditions.
Today was something new for me. After the coolant reached operating temperature I looked back down at the temp gauge and it read about one to one and a half needle widths cooler than straight up. I kept my eye on it and it came back to straight up after about 30 seconds to one minute. It did this a couple more times during my fifteen mile drive to work. The drive home this afternoon at 16 degrees (F) was uneventful as all previous days.
Is what happened this morning at 0 deg. normal for this engine?
Thanks, R.C.