[SSE 4 2SS]

Originally Posted by stevieturbo

Very much disagree, burning oil is never white, and it always stinks. That's just a simple fact whether some perceive it differently.

If no part of your breather/PCV or whatever is piped so oil can ever find it's way into that cold side plumbing, then it is either the turbos are screwed, or huge oil drain issues ( which again can come back to inadequate crankcase breathing too )

But with turbos mounted high like that, there should never be any need for external scavenging, although as a desperate move it could be considered.

A simple and full 5/8" drain from each turbo to front cover or pan as already mentioned is more than adequate.

IMO avoid all this AN nonsense, as even whilst some might think -10 is 5/8", the actual ID of many of the fittings is even less than 1/2", some even closer to 7/16", just rubbish for this application.

And what you shown as an oil drain running sideways across the engine bay...as already said, that's never a good option.

Keep it simple, good gravity drain and always downhill. Never sideways, and shortest route possible.

And you will need to clean all that oil out, as it could be falsely causing the smoke even if you manage to fix the initial problem.
It takes very little oil to cause a lot of smoke

KALCORP, you don't know me but please please listen to stevieturbo. He may be one of the top two of three turbo folks on this forum, ever.... and i know most all of them worth listening to...

He's a little wacky and from across the pond, but he knows of what he speaks....

I have low mount twins and a dry sump for oil scavenging, but there has been many a time in the past Stevie was able to guide me in the right direction.