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.
Quote:
Originally Posted by 123Britt
I think 220-240F is an optimal range for our M235i N55 -- and this really makes me wonder how a 0W-30 wt oil which is usually calculated at 212F for viscosity - is appropriate. We need a Poll of avg oil temp at 80f --- not very definitive but would be interesting.
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