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I've been monitoring my 335xd for a while now with a BimmerLink app and the optimum coolant temp seems to be around 80/85c. No higher then that ever.
Oil temps take a while to warm up and also stay around 80c when fully warmed up.
If you drive the car hard the oil will go to 90c for very short periods and then back to 80c..
Bear in mind that with all this cold weather the car will use more fuel, as it takes longer to get upto operating temps as cold start injection will continue to run untill car is at least over 60% on the coolant temp.
I can also notice decline in mpg but i defo put it down to the weather
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