My wife was coming home from work and she looked in the mirror and could not see out the back as there was a cloud of WHITE smoke. It was dangerous as people behind her couldn't see and it was causing mayhem on the highway. There were no warning (check lights) on the dash. When she pulled over the car stopped running. She could not start the vehicle. We had the car towed to the original Dealer who said they hadn't seen this before. 3 days later they said it was a faulty PCV valve and that the part had been superseded by another and they replaced the PCV valve with the new part that was from a different manufacturer than the original. They said the new superseded part is steel and the original was (aluminum ? or other but not steel). They also said the oil was low. It shouldn't have been low as I had recently changed it and afterall it is a new vehicle. It is now the day after repair (30 miles put on it since repair) and I still see a little bit of white smoke and a very noticable smell of burnt oil when she departed. The dealership said it could take a few days to burn off inside the exhaust system. I'm hoping the latter is true. Could the bad PCV valve have caused any permanent damage to this vehicle? Not a good start for our first Subie. Thanks for any insight.