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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I�m handing him tools and he says, "give me that..." and I�ve already got it in his hand or "hand me that....."and I�ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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