Agree with everyone else to use HyTran (or EQUAL - don't use cheap oil in anything) for the hydraulics. Gear case should be 80w-90.
Engine oil can be a hot subject. As was mentioned above, the SG/SH oils are a lot more improved than what was available in 1950, and offer a lot better protection at a lower viscosity to reduce wear at a cold start. Do some reading at BobIsTheOilGuy.com - very educational, then make your decision.
I'm using a 10w30 in my SA because it was worn out when I got it, otherwise I'd use a 5w20 all year.
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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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