I have owned three Mooneys (over 3,000 hours) with the Lycoming engine. I have had the exact installations of the Mooney as the person who was having the high oil temperatures (What is the maximum oil temperature for this engine? July 22 issue). Never in 3,000 hours did I see an oil temperature over 180°F.
I would suspect an engine problem or a indicator error. They just don’t run hot in this application.