I was recently blowing blue smoke out of my exhaust while letting off the throttle while driving. I would hit 10psi, and then when I would shift it would blow this smoke for about 1-3 seconds. I originally thought this might of been bad turbo seals, but also just thought about my PVC system. I currently have it setup like this:
Intake manifold to crankcase, crankcase back to charge piping, Could this be just oil getting into the charge piping and causing this issue? When I had the PVC system unhooked I never had these issues.
On the DSM, I had some issues that I fixed with PCV hollowed out, line into a catch can. Side breather off of the valve cover into same catch can, and then one line back into intake, post MAS.
On the catch can, I had a PCV valve out of the top, to let boost (blowby) out, but under vacuum, it kept closed.