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 - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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