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Have to disagree with you slightly, G.L. The oil level should be between the two level plugs, not full at the lowest plug. "Although the oil level should be maintained to the level of the top plug, no difficulty will be experienced if the engine is operated with the level slightly below this top level. Under no circumstances should it be operated if the oil level is below the lower plug." You are supposed to drain the oil down to the level of the lower plug and refill with fresh oil every 10 hours of operation if you are running on distillate, replace oil completely at 90 hours operation. Every 30 hours if you are running on gasoline, replace oil completely every 120 hours (although I have never thought this necessary on gas.) The capacitcy is 5 quarts if you are changing the oil only, SIX quarts if you have drained the wet clutch as well. (The wet clutch refills from the oiling system.) Good point about a petcock on the oil pan hitting something and opening... that's why I have the type where it's a spring loaded plunger with a pull-ring on it. There were 7,540 "SC" models built in 1941. -Schotte
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