Quote:
Originally Posted by amw896
Did some searching around and it seems 240-250 is pretty normal, some run marginally higher and some a bit lower. This is mostly based on E90 N55 that actually had an oil temp gauge. Looks like once you start breaking the 250's (middle to high) then it's trouble town.
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240-250 is quite normal in these cars in daily and hard driving. The temps are quite stable once the oil is fully warmed. As for exceeding 250 degrees, I wouldn't worry about it much. Performance oils like those used by BMW, especially euro formulas, will do just fine even living in the 260 range for short durations. Oil tech has improved massively in the past 10 years.