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Being an old timer: you ran thicker oil to prevent oil bypassing places where it should stay. Usually you found external evidence that it was leaking like a trail of smoke when accelerating, trail of smoke decelerating , smoke cloud idling. Oil fouling the plugs. Note the trend. With 50 weight you primed the crankcase with fuel to thin the oil enough to start an aircraft engine any time it was colder than 45f otherwise it wasn't going to crank.
Todays stuff has tighter clearances used than olden days had as new
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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