The deal with using non-detergent oil in an old H is because you don't know what was used in it before.
The fear is that the engine is full of sludge and the detergent oil will loosen up the sludge and cause it to clog up oil passages. This will starve the engine of oil and ruin it.
Chances of that happening are SLIM. Non-detergent oils are not common and haven't been common in decades. Odds are good your old tractor has probably been using detergent oil for the past 20-50 years and didn't even know it.
Before the Internet people didn't have anywhere to ask, so they just went ahead and did what they thought was right. The tractor is still around.
Even if somehow the tractor managed to sneak through with nothing but non-detergent oil, for what little we use them these days the detergent isn't going to hurt anything. Maybe if you used it 10-12 hours a day, 7 days a week it might eventually loosen up something nasty, but for puttering around the yard... Nah.
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Today's Featured Article - Oliver 550 Clutch Overhaul Tips - by Greg Sheppard. I got my 1964 Oliver Model 550 (serial 141-139-519) second-hand and used it for several years before the clutch began to slip. After taking up the pedal linkage several times I saw it was going to take more than that. The engine had been leaking oil at the rear seal and I suspected
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