I had this in a C182H at night about 20 years ago.
Heading into Bankstown on a 40-something degree summer's night the oil temp went through the roof (pressure was ok) and the prop went to full fine.
Had to pull the MAP back to about 18-20" to avoid overspeeding the engine, and we were getting about 80 kts IAS.
Not a fun night. Still don't know what caused it and the same aeroplane did it to 3 or 4 other pilots over a period of years.