Sounds like you're getting some bypass from the crankcase and it pushing a bit too much oily mist out of the breather which is connected, via a small hose, to the turbo air intake. A small amount is pretty normal in both of the turbo hoses and most people fit a Provent filter/catcher which stops most of the oil getting into the big hoses..you just have to remember to empty it every so often.
I meant to add, that if you are worried about the turbo seal, pull the air intake hose off (between the airbox and the turbo) ..you will see where the small hose comes from the top of the motor...if you have the oily crap between that little hose and the turbo end, it will be as I said above. If it's clean and dry all the way down, then you need to look at the seals. My 2.5crd is the same as your 2.8 and I just keep it clean.
