That's a good question for which I do NOT have an educated or scientific answer. One could argue using straight grades of oil such as SAE20, 30, 40, 50 when and wear necessary, under the right temperatures, which WOULD require changing oils more often, which most people would not, at times including myself. One could then argue maufacturer suggested specifications, which these days are generally multigrades, possibly based upon scientific knowledge, improved technologies, or experience, or a knowledge that most have gotten lazy, so multigrades are the lessor evil to meet minimum requirements. One can never got wrong by following manufactrer suggested specifications, and that being said, I have in my fleet of vehicles that include two Cummins Dodges, that I follow manufacturer specs on, tractors and other equipments that I follow manufacturer specs on, also a Buick Century and Jeep Cherokee that the manufacturers suggest using regular unleaded gasoline in, but I have always and will always use premium unleaded, the same as my Allis Chalmers B lawn mower. The Deeres, the Massey, and the Case are all diesel, and other than fuel additives, get what are manufacturer suggested specs.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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