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Make sure that the drain line from the turbo has a big enough i.d. and no sharp bends in it. It's way easier to reliably pump oil through a line than it is to suck it out the same line...When you look at a factory setup, the turbo feed line is a little steel pipe, about 1/4" i.d. The drain hose is usually at least 1/2" i.d., if not bigger, and it usually goes in a gentle curve from the bottom of the turbo straight into the side of the sump, no more than about 12" long.
Cripes! You'll be right then. Maybe a pressure reducer on the way into the turbo, to get the oil pressure back down around 20-30psi will stop it blowing oil past the seals?
As soon as the oil hits the center section of the turbo the pressure goes to nil.