Dumb things that you did.......because you didn't know any better.
My first car was a '55 4-door dodge with a Red Ram V8. As I was changing the oil one time, I noticed that there was a deep deposit of sludge in the bottom of the pan. Of course, I reasoned that the sludge needed to be removed and the engine "cleaned out". I wasn't about to drop the pan, so I just re-filled the crankcase with kerosene. I cranked her up and ran it till it started knocking, turned it off, drained the kerosene and re-filled with motor oil. Hell, it was still running fine the day I sold it. I don't recall any sludge coming out with the drained kerosene:realcrazy::realcrazy: