OK, you're the closest to anyone I have ever heard with an actual experience of detergent oil supposedly causing damage. I suspect he was wrong about his diagnosis.
My experience is that I have always put detergent oil into any old tractor I have bought with no discernable ill effects. We're counting 56 farm tractors, three bulldozers, and two road graders.
The worst was a '39 M which failed to drain any oil after I pulled the plug. We'd been using it a while like it was bought, with a broken oil pressure gauge. After a momentary feeling of horror I poked a stick in the hole and a little water and a lot of black oil came out. After refilling with detergent oil and using it almost a year (it has a Farmhand loader) I went to change the oil and again NOTHING came out. Another stick and oil came out. Yeah yeah I need to pull the pan and clean it out but the detergent oil did not and does not dissolve and break crude loose. It does tend to keep curd in suspension but it does not even do that really well.
Those who have overhauled an engine will testify there is always crud in the oil pan and on the top of the head, even with regular oil changes with good detergent oil. Try using detergent oil instead of diesel or solvent to clean up an old pan.
So I just believe it is an old wive's tale, similar to "12v will ruin a 6v starter". Both sound logical but in practice they just do not happen.
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