Coming from intercooler hose? I had the same a few weeks ago, loss of power and massive oil all over the engine. Cleaned it up, changed engine oil just to be sure, and now no more leaks and normal operation again...
If I didn't know better I'd have said you'd stolen that picture from my phone!!!!
Mine was doing the exact same thing, not very easy to find at first but it was the IC hose, when I took it off and deformed it in my hands, it appeared that the jubilee clip holding it on had been overtightened and had pierced the pipe causing it to mist everywhere!!!
I've found the best stuff to remove the gunky oil with is this stuff as you can brush it on and wash off