The temp gauge on x5 is useless. By the time it ever moves it's too late and usually means a catastrophic failure of some part usually the coolant reservoir.

There is a way to turn the non gauge been into a gauge.

Usually I notice a problem when it's cold outside and I get no cabin heat because the t-stat fails open. Unfortunately if that part faults in summer you might drive a few thousand miles in open loop running rich. I'll like to put scanner on and drive with Realtime temp display at least monthly

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)