Hi Dan
I have fitted a dual digital Oil Temperature and Oil Pressure gauge to my M3W and before I subsequently fitted a pair of 140mm dia Spal fans (1 behind each cylinder).
If I got stuck in traffic the oil temeperature would, on occasions, reach around 110°C (230°F) without the skip fire mode kicking in.
Since fitting the fans, when I see the oil temp coming up to the upper 90's, I manually switch them on to bring the temperature down.
I don't know what temp the factory cooling pack cuts in at.
Got some photos of how those are fitted?