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 - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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