As CNKS pointed out, any modern oil is going to be better than what was in there in the 50's. The quality of oil has been continuously improved by technology.
That being said, the newer CJ-4 stuff is engineered to be backward compatible. ZDDP is old tech stuff and newer tech stuff is replacing it.
Another thing to consider when you look inside these older tractor engines is that there is a lot of bearing surface area for the loads and power levels. Also the valve springs loads are relatively light in keeping with the low rpm's these engines run. They would probably do fine with just about any modern oil, although I wouldn't go lighter than a 30 straight weight or 15w-40 myself.
It's more important to keep clean oil in it than to have fancy oil. The racing type oils have higher zddp levels, but lack the quantity of detergents needed for street driving and tractor use. They know racing engines don't put very many hours on an oil charge.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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