On the back of my K04 is a flexy pipe that goes into a steel fixed one with a nut on the end, sits in the middle of the turbo, just behind the TIP. I guess ita likely to be oil, well when cleaning my tip I noticed it was loose! Very loose! Tinged it up with a 17mm and all seema good. I can upload a picture later when I am at my PC if that helps anyone. Thanks.