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 - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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