Replacing all seals and gaskets. One of the only things I did not touch was the turbo oil feed lines. Now my drivers side turbo is leaking just like this, but I have narrowed it down to the oil feed line. Hopefully it just needs to be tightened. I will be doing that this weekend. It is hard to tell from the pic you sent if its your feed line or not. the oil feed is 90 degrees on top from the water line(side). If you can see oil on the top, (where the feed line goes into) then its got to be the line.