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The exhaust gases combine with oil vapour from the turbo and form a black stocky gunge. Inlet manifolds and egr's can get pretty clogged with it which is why a lot of people deactivate the egr.:)
 

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The other choice is to take the camshaft(rocker) cover breather pipe that would normally go into the air intake and either use a oil catch tank or let it go to a filter or just leave it open somewhere down below the engine. You would need to block where the pipe went into the air intake.

Here is a thread with a few different methods and pictures to give u an idea...still vag pd engine.

http://briskoda.net/forums/topic/100913-diy-guide-the-elephant-hose-ccv-catch-can-mod/


As mentioned above the egr gasses and hot oil engine fumes do not mix to make a sludge. You still get stuff in your pipes but hopefully not as bad over time.
 
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