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OP, the oil temps you described are the same as what I have seen in my Z435 (N54 engine, DCT gearbox) during 90F ambient temperature days here in Socal. The car goes into power reduction after a few laps.
I haven't had a chance to track my F30 335 yet, but I am expecting the same issues. My 335 is sport line, so it has the 600W radiator fan and oil cooler, same as the Z4
The F30 335 M sport models have 850W radiator fan, same oil cooler and additional radiator in front of the driver side tire. I think this could be why you are seeing such different temps from jetbill, whose car has more cooling equipment
I tracked an F30 328 and the oil temps stayed below 250F. Ambient temps were 50F. I think the N55 makes more heat than N20 due to the higher power
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