I continue to get about a good teaspoon of oil per thousand kilometres in my catch can, definitely stopping a very worthwhile amount of oil. That has to be a good thing, rather than that oil going through turbo/inter cooler and into the manifold.
Of course, how much is getting past the catch can, I do not know.
PS pulled my EGR pipe off the other day, (it's just two bolts at each end), very easy, and don't like what I see- a lot of gooey black crud in the pipe, and inlet manifold.
I'd love to block the EGR but suspect it would immediately throw fault codes and possibly cause other problems, so at this stage that's a no go.