Subaru - Forester :: 2005 - Excessive Oil Burn After Replacement Of AVCS Solenoid

I have a '05 Forester XT with 135,000 miles, I purchased the car new and have always performed regular maintenance and oil changes. The car is my baby.On a recent freeway drive I heard a "pop" followed what sounded like a shredding accessory belt. This went on for several miles with diminishing power. There was zero smoke from the exhaust. I managed to coax it into the nearest Subaru dealership. They diagnosed a bad AVCS solenoid, with P0011 error code. They charged me $2200.00 to change the solenoid and clean all the oil feed lines! While they were at it, I had them clean the banjo bolts to the turbo, as this had never been done. The engine was removed from the vehicle for them to complete the work.

Today I went to pick it up, it started right up and idled fine. When I pulled onto the highway and accelerated TONS of blue smoke billowed from the exhaust and it had zero power. Before this the car burned one quart of oil every 3,000 miles. I turned around and the car is now back at the dealership.I'm at a loss as to what to do. The car is not driveable at this point.I hate to point fingers, but what could the dealership have done to cause this excessive oil smoke? Again, the car NEVER smoked before the dealership got a hold of it.