I suspect it's more of the oil temp indicator coming off the peg on mechanical gauges. With ambient temps in the 90s it's wise to know that the oil temp gauge is actually working.
YI always thought Lycoming advises not to prolong the ground time - get it flying.
Thanks
That is the general wisdom. However, this 100* OT thing just will not go away and folks seem to give that MUCH higher priority. I see guys idling on the ramp for 15-20 minutes in the winter trying to reach that magic number. All my engine experience and knowledge tells me that Lyc is correct - get the key parameters (like cyl temp) to where they need to be and then go.
I’m not sure where the 100 degrees thing started. However, when I took delivery of my factory new 0-360 from Lycoming last year, the gentleman at Lyc I was working with recommended 100 for takeoff. I recall him saying that they used to recommend 80, but now like to see 100.
That’s what I do now, assuming all other parameters are ok.
I would imagine that there’s some common sense wiggle room here.