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 - Preventing Tractor Theft - by Staff. The discussion started with the following message: I have a JD A without key start or any locking device. Is there a best way to secure it so the chances of it being stolen are reduced? Following are some of the answers that were received: Take the rotor out of the distributor and hide after each use. The would-be thieves at least couldn't just get on and drive away.
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