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 - Tractor Profile: Ford 600 Series - by Staff. The Ford 600 Series tractors bean production in 1954, and continued until 1957. Quite similar to the Ford NAA (Golden Jubilee) in design, it used the same 132 cubic inch Red Tiger engine with 31 horsepower. Several different models were made in the 600 Series, and these numbers were used to denote whether they used a particular transmission, hydraulic system, or PTO. The result was five different model numbers: 620, 630, 640, 650 and 660. These break down as follows:
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