Yes. I have one of the Harbor Freight infrared touchless thermometers and measuring around the crankcase, mine don't run all that hot even with me running them "where I want" in rpm. I was surprised. I don't remember the number but could go and take another reading the next time I use a mower. It was less than 250F after several hours mowing pasture edges at about 3/4 throttle on one of the BS V twins. 185 area comes to mind. Obviously the combustion area was higher and ran up around 400 as I recall. So, I guess the answer is the oil used to cool the OHV part of the engine is where the oil gets exposed to the most heat as one would expect.
On the HF Thermometer, they are cheap and they are real handy for a lot of things around the farm. I had a JD 4230 overheating and it helped me isolate the source of the problem among other things. They are just real handy.
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