Originally Posted by enrita
If that much oil is being dumped into the rear turbo intake tube, I would look at the PCV system, although it could be coming through the DVs as well, though the oil would be distributed to both intake tubes. Maybe the front turbo intake tube seal is holding up better? The rear turbo intake tube sometimes doesn't seat fully on the seal.
OP, you can take off the line running from the OCC to the rear intake tube and check that for oil. It should be clean. "