I did some more mowing at a different location this evening with a zero turn mower with a Kohler Command CV25 engine and 61" deck. Outdoor temp was about 80 deg F. After an hour of mowing I checked the oil filter external temp with an Infrared gun and found that it was 218. That is an ok temperature and will boil off any water that might have condensed in the crankcase. However, the oil temperatures that I measured today are concerning because it was a cool day here. When the outside temperature gets over 90 deg F I believe these oil temperatures would be approaching 250 deg F, which is generally considered in the thermal breakdown range for conventional 30w oil. If that proves true I am going to change to Amsoil 10w30/30w which should have a slightly higher safe operating temperature compared to conventional oil. I hesitate to do this because Briggs and Stratton says that oil change intervals can not be extended when using synthetic oil. I think that they are right on that issue. Small engines can load the oil with soot and particulates more quickly than liquid cooled engines, and once the oil has the maximum amount of particles in suspension that it can carry it is time for an oil change.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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