Originally Posted by
scifi
, I have never had the T+Ps not in the green.
As mentioned, its not only having the oil temps in the green but for how long. Lycoming recommends temps at 165 to 200 for one continuous hour which does not include taxi, takeoff, and landing times. TCM states 1 hour flight at normal operation temps. Anything short of that and you leave water vapor in the crankcase. Regardless, in my experience the IMC point is a red herring as if that was true half the piston fleet in the US would have milky oil and they don't.