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      02-15-2017, 12:35 PM   #49
UnhappySwede
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Drives: BMW X5 F15 -2016
Join Date: Feb 2016
Location: Sweden

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I drove 50 000 kilometers over a year but I still try to do this now and then. I shifted down to the 6th gear on a nightly highway cruise, driving some 90 miles per hour on high Engine revs. What happend was that Engine oil temperature dropped almost to 40C. Wtf?

I geared up and drove it more gently, temperature rose up again, I shifted down and it got colder again when it should actually become hotter. I did the procedure a third time and then the Engine temperature needle stayed at 12 o Clock, regardless of gear and speed.

So my thermostat lives a life on it's own too. Sometimes I have to drive it really hard for 30 miles to even get the temperature up, and now that same behaviour cased it to drop instead.
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