Data point for the record. Photo below is a standard Lycoming o-360 (updraft sump for a carb), looking in past the #4 rod. The slots in the bottom of the case lead down into the sump; they are the oil drains. Here the sump is completely full to the top of the slots. With longerons level, the supplied dipstick indicates approximately 7.5 quarts.
BTW, with longerons level, 7.5 qts is below the rear prop governor drive gear. However, I'm pretty sure this gear is spinning semi-submerged when the tailwheel is down. Borescope through the rear case web into the accessory case:
BTW, with longerons level, 7.5 qts is below the rear prop governor drive gear. However, I'm pretty sure this gear is spinning semi-submerged when the tailwheel is down. Borescope through the rear case web into the accessory case:
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