I have a M1009 with a banks turbo that recently had an interesting leak, it was sucking oil through the CDR and gathering on the original air cleaner lip then seeping out through the inadequate paper gasket.

It got me thinking that there has to be a way to limit the oil that goes into the engine even with a good CDR. I'm thinking of making an expansion chamber with a baffle and putting it inline with the CDR, so any oil vapors will condense and liquid will run into the baffle and collect at the bottom and drain back to the pan. A major problem with this I see is that it could also condense some of the bad stuff that in crankcase gasses.

The way I understand the CDR is that it allows it to pull a slight vacuum but not enough to suck in oil. So the concept would still work without it but would suck alot of oil. I think it would be a good idea to keep it in the system to regulate the vacuum but the expansion chamber would remove the oil. Do this sound like a good idea?

oil gets through even with a good cdr

you could add a catch can, most people put steel wool or something in it for the oil to catch on. put both nipples at the top of the can, add a divider with passage at the bottom, fill both sides with steel wool, empty oil as needed

just plumb this in after the cdr and before the intake (air intake/filter assembly)

or just let it burn the oil.........

You could do that its not a bad idea.
I am going to be running valve guide seals so I am just going to let the oil burn, but not before it lubes the valve stem and valve seat.

It just makes such a mess of the intake track and can't be good for it to inhale oil and compress it, even in small quantities.

It just makes such a mess of the intake track and can't be good for it to inhale oil and compress it, even in small quantities.

Uhm, what? Your engine inhales and burns oil constantly - that's what dieseling is! Diesel fuel isn't like gas - it's actually just a light oil. You can get a diesel to run on peanut oil if you'd like.

A little oil down the intake of our trucks isn't going to matter a smidgeon - and unlike a little oil in a gas motor, in small quantities you won't be able to tell by the exhaust, as it'll be burned up same as your diesel fuel.