better read again then,
i dont want an arguement, just trying to point out whats happening.
the drain you are talking about is not a drain, its a vent, its about equalizing pressure.
therefore, the way i said is what people are doing without any oiling issues, to vent the sump. hardly any oil in the tanks.
ultimately, if you dont have oil restrictors in the block, then everything is bandaid.
from the head to the sump, or from the sump to an intermediate can to covers is all a vent.
i worked this out while reading this thread.