One thing I wondered about the non det. oils, were'nt they better suited for your old oil bath air cleaners, as the contaminants settle out. vs. being held in suspension by the modern det. oils to be caught by the filter in pressurized lube systems ?
2 applications I can think of are the old Donaldson air breathers with pre-cleaner jars and engines that have sump pits, splash lube lube systems with a deep sump under the crank and bearings. The old vertical 2 cyl. 24 HP Cat starting engines are built like this, having 2 deep sumps underneath. By design I assume the oil would settle out the contaminants, but this little screamer of an engine has inspection covers that allow access to clean out those sump pits, and once clean, either oil would be fine, modern probably better. I tore down an old 14hp Kohler K321 from the late 60's not too long ago and the oil pan was heavily sludged up, but you could still see the cross hatch on the cylinder walls.
I can see some validity for non detergent oils in those air breathers as it would settle out, vs suspended but does one or the other still perform better in that application.
This would make a good "Myth Buster" theme, take an old gunked up engine and see what the det. oils do.
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