Since I have never verified the actual oil temperature on my small air cooled engines I thought it would be a good day to try it and see whether there is any substance to the idea of air-cooled engine oil running hotter than liquid cooled engines. It is 71 degrees here today and I measured the oil temp on my Jeep Cherokee engine after a 10 mile drive on the highway. It was running at 152 degrees F. I had some mowing to do which I used a wheel horse tractor with Onan p220g 20 horsepower engine. After 20 minutes of mowing the oil filter external temperature was 204 degrees F. Since it is a very mild day here I have seen enough evidence to be convinced that air cooled engine oil run significantly hotter than liquid cooled engines operated in the same environment. That is reason enough for me to run a different engine oil in my air cooled engines compared to liquid cooled. Everyone is going to have a different judgment on this but I believe it is worthwhile to make sure that your air-cooled engine oil is not running too hot which is going too shorten the lifespan of the engine.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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