The 15w40 oils are ideal because of their additive content. However, these engine are overbuilt and the unit loading on the sliding cam and rocker surfaces is low and on top of that you have relatively light valve springs. As the others are saying, any modern oil that has an SAE label will be fine so consider the ambient temperature range you'll operate in. I can use 15w40 year round because it's not as cold as for the folks up north. I would not run a 5w or 0w oil though, I think that's too thin. Whatever you do, do not run "non detergent" oil.
You don't need oil additives or any other snake oils. The oil companies have fixed it for you. As Delta Red is saying, the worst oils today (as long as it has an SAE label) are better than the best oils when the tractor was new.
One of the very best things you can do when you acquire an unknown tractor is to drop the oil pan and clean it out and check the pump inlet screen. All kinds of crud can accumulate over the years and the inlet screen can get partially blocked. I've looked into some tractors that were pretty on the outside and not so pretty on the inside.
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