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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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