230 is way too high on a regular basis for oil going to the cooler much
less returning to the engine from the cooler. The generally accepted
number is 180 degrees at the point where most of us are getting our
readings from.



john smith wrote:
Ross Richardson wrote:

The probe goes into the Lycoming spin on oil filter adapter.


So long as the temperature of the oil returning from the engine is
around 230(?) degrees F, I wouldn't be too concerned. If it isn't
getting over 210, I would wonder if it was getting to all the places it
is supposed to get to.