Ok this makes more sense, basically I think he was talking about the vacuum created by PCV aiding in sucking out of the return of the turbo. That makes more sense to me.
His Reply to my question–
he “seals” in turbo chargers are actually metal piston rings, and not seals at all.
They are more like dams.
The oil goes into the turbo by way of oil pressure from the pump.
It returns back into the engine by way of gravity and vacuum from the pcv system.
The oil seal on each end of the turbo (compressor and
turbine) controls oil by way of pressure differential.
On the compressor side:
-Boost pressure pushes oil back away from the seal into the bearing housing -PCV vacuum pulls oil back away from the seal, into the bearing housing
On the turbine side:
-Exhaust pressure pushes oil back away form the seal into the bearing housing -PCV vacuum pulls oil back away from the seal, into the bearing housing
Take away one of these variables, and the turbo will leak oil.
Also, make sure your oil pressure isn’t extremely high. Typically any thing over 45psi (unless its at
WOT) is too high.
Check to make sure your drain line is -10 or larger, isn’t going up hill, clean, and isn’t kinked.