Thanks for the clarification, Tim and Smartech.
I just thought of this for a moment. The drain plug is still the lowest point of the sump. There is an quasi-steady level of oil in the sump, of course given the constant flowrate of oil circulation etc. That level of course is higher than the oil drain plug.
The one follow up question I had of course was whether the Garrett is located higher than this oil level, which seems to be from the two pictures you have.
The other thing that popped into my mind is that there is suction from the drain plug area due to the oil pump, which explains that special drain plug/filter design. So there will be a positive pressure difference from the turbo to the drain plug area in addition to gravity. And I take that this difference is significant enough for oil to only drain from turbo to sump, unless of course the pump fails.
Brilliant design, Tim. Killing two birds with one pebble. Neat oil return line and ability to return to stock w/o a trace.
In any case, if you can make Pablo's M3 go at that kind of speed, I trust your engineering with this micro kit.
