Depends on what was previously used in the tractor or if a new rebuild?
If it always had detergent oil or a new rebuild then use detergent oil.
If it hasn't been rebuilt in a while and was using non-detergent stick with it. I wouldn't want the detergent in the oil dissolving all the old dirt in the engine. It will wear the bearings faster and I've even heard of it plugging (old clumps of dirt) oil passages and spinning a bearing.
I would defiantly not use a synthetic oil and recommend that you drain it now and replace it with a non-synthetic.
Synthetic oils are really 5wt or lighter oils with modifiers so they will act like 30wt oils in modern high temp engines --- and they have thinner films. Your relatively low temp old engine was designed for and needs the thicker oil film. Synthetic oil will actually wear the bearings in your engine faster.
By the way, you don't have an engine oil life issue as the old mineral oil will last a lot longer than the change interval. It's the dirt and moisture that accumulate in oil that cause the problem. Second reason not use synthetic is cost - your wasting money on something your tractor doesn't need. In fact it could be killing it.
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