E39 M5 oil temp and coolant temp off the scale

[fatmansv8]

Hello all wondering if anyone can relate or help with my M5. I was driving along on the motorway doing no more than 60 - 70 mph as usual I glanced at the gauges and the engine coolant temp went off the scale and the oil temp was reading aroung half way . The car still ran ok this has happened a few times now, all motorway journeys. After pulling over and checking the coolant level and oil levels all were normal . After switching the engine back on the gauges read normal. Any ideas guys please.
Thank you FatmansV8

[RichardM5]

It's not an uncommon problem. Could be the dual temp switch that's on the thermostat housing or the connection to it, could also be an intermittent fault with the cluster.

[Hedgetrimmer]

Had something similar happen to mine although it was only the coolant temp that was high. Turned out to simply be the sensor which simply shows fully in the red when failed. Did the car smell hot?

[fatmansv8]

No not really all normal . The oil temp went half way up at the same time. Drove ok too. Like I said I turned the engine off and then on again immediately and it showed normal on the gauges.
Thanks
FatmansV8