Originally Posted by chevytoo
Possible the Temperature control, oil cooler bypass valve is stuck open. Oil will then be sent through the oil cooler instead of being bypassed back to the oil sump until the oil warms up. Just a thought.
This happened in the middle of a flight, it went from reading normal to instantly reading low by 50 degrees. I found the nut holding wire on the end of the sender loose and tightened and thought I had it solved but next flight it still read low.
New sender arrived so I will give that a try and check for loose grounds