Hydraulic fluid didn't exist back then. All they had was motor oil. As the letter series were nearing their end IH was having people add an oil conditioner to their engine oil. This gave the motor oil properties more like hyd fluid.
Only pros IMO. The big con is if you run engine oil any implement you use or borrow must have engine oil instead of hydraulic fluid in it otherwise you will cross contaminate the two oils. Everything will still work, but you will dillute your engine oil "hyd fluid."
I will leave the pressure relief question to the pros, but I think I know the answer.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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