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 - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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