You can find oil, some from the turbocharger and some from the CCV, in that charge pipe on virtually any turbodiesel in existence. It just is. Now, if the amount is concerning, then you'd have reason to worry if you poured 1/2 liter every week out of that location, but otherwise you'd need to do some research to see what a reasonable quantity is.
Turbochargers ooze a little oil on the impeller side (intake or compressor side) as a matter of course - the oil pressure supplied to the center and bearings is greater than the air pressure the impeller develops. Since the seal is a non-contact type (I believe it is referred to as a labyrinth seal) and this because of the extremely high rpms reached by our small turbochargers, then a little oil will ooze past and get blown down the intake charge pipes. The CCV also provides a lot more volume in terms of blow-by and other oil vapors, and between the 2 sources you get some condensation and collection there at the bottom of the intercooler.
A lot of people figure you need to run it hard for 10-20 seconds every hour or so of operation to make sure you don't collect too much liquid there. A slug blowing into the intake and into a cylinder wouldn't do the engine a lot of good or it might cause the engine to run away. So running it up on occasion helps keep too much liquid from building up.
Even so, I've never pulled one apart and not gotten a surprise of 200-250ml of liquid that looks like runny printer's ink. Only if I pulled it after having already pulled it within the last day of running.
Now, for the other - oil leaks from the turbo. Ordinarily the only leakage happens inside the plumbing. If there's oil coming from the outside, there would be 4 sources: 1) loose or cracked oil supply line connection(s), 2) loose or cracked oil drain connection(s), 3) leak at intake or exhaust plumbing connections (if it is dripping there you have big problems), 4) oil dripping from an engine leak above the turbocharger such as a valve cover leak. Of these, I think #4 is far and away the most popular.
How is the oil consumption? How often do you need to add oil and how often (that is, how many kms do you go and how much oil do you need to add)? Finding the correct source of a leak such as you describe can take some time and might be tricky.
Good luck sorting this out.
Cheers,
PH
PS: Oh, and "due to software". Not sure what that means. If he thinks that software is exercising the turbocharger more than it should be and therefore wearing it out, then maybe so. They won't last forever. Some brands seem to last longer than others, but I don't know that anyone has run a comparison on that because every installation is different and you'd be comparing apples to oranges. The best thing to make sure the turbocharger is going to last is to ensure you are feeding it clean air, and good clean synthetic oil. VW's approved oils should be your guide to the proper quality oil.
