You should check the PCV tubing that connects to the rear turbo intake duct. If you find oil in there (which I imagine you will) then maybe it is time to use a oil catch can.
This picture shows a catch can and the arrows point to aftermarket tubing, but notice the point where it connects to the intake duct. See how it has the wires running out? Pull the PCV tubing connection off and check for oil here.
I also use about 1 qt every 3k miles. Or are you talking 3k kilometers?