Andrew, you're right, below was posted in one of the threads I found. Supposed to be from WDS.
Poster said he found it at the E53 X5 4.6is section, but it mentions S62? But at this point I assume they are probably the same system considering the E53 and E39 are pretty much kissing cousins.
Quote:
Oil temperature gauge
On the M-models, an oil temperature gauge is used in the instrument cluster instead of the fuel consumption indicator.
The oil temperature displayed in the instrument cluster comes via the CAN bus from the digital engine electronics to the instrument cluster. On the S62 engine, the oil temperature shown in the instrument cluster is displayed as a mean value of the oil temperature measured value of the oil level transmitter and the dual coolant temperature sensor (temperature engine exit).
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Sixth post on this page:
https://www.bimmerforums.com/forum/s...retrofit/page3