I had an uncle who I heard used kerosene as a sub for
antifreeze.
I did have a 15hp kaw engine on my mower that suffered
oil dilution from fuel that I didn't know at the time, though the
oil level was suspiciously higher than normal. Two lawn mowing trips later the rings were shot, couldn't get it to run without ether and the choke had to be used to keep it running. result--toasted engine.