Tonight, I pulled out the intercooler piping made of PVC and sprayed it black. Looks much better now.
At the same time, I also built a catch can out of a bit of PVC, the cap from the black spray paint can, a paper towel, some left over vaccum line from the evap system, four zip ties, and (of course) some duct tape. I strongly suspect that the oil was spraying from the turbo return lines because blow-by was pressurizing the crankcase and the easiest way out for that pressure was the return hose and fittings.