I had my TSIO 550 engine rebuilt after a prop strike at 50 hours total time..  The rebuild shop called me saying that there was something seriously bad with the engine, after they put it back together, because when they tried to run it, it was running extremely rough, smoking , and dripping oil.  They suggested that I replace the rings.  Huh????  I asked them to call the TCM folks.   Come to find out that they had the oil breather clogged...???

If your leaking oil from the turbo, check for a blockage in the return lines.  Something is just not right.  Have you checked with the TCM folks.  If not, give them a call at 888-826-5465.  They have heard it all

Good Luck,  Bill Hogarty