if you unlock the OBC computer in the cluster, you can read the actual oil temp, i think it is OELTEMP or something like that... to be honest, i did not look at how much a "normal" reading should be, but i am sure folks hee will take a note and can report the info for your comparasion...

once you establish that the oil is running at normal temp, then you will worry about the incorrect readings... if, on the other hand, the oil REALLY runs hot, then you need to dig into issue much deeper, to figure out what was disturbed while the work was done...