What gives? I just got a recall notice, now the fourth in a year and a half on my 2013 ATS with turbo/four wheel drive. This one is the most serious: "We have learned that your 2013 model year Cadillac ATS may have a condition in which piston damage could occur due to an engine pre-ignition condition. If this condition occurs, the vehicle may perform poorly and oil consumption could increase. A warning light may illuminate indicating an engine misfire. If this repair is not completed before multiple pre-ignition events occur, the piston may be damaged and the engine may need to be rebuilt or replaced." Ha? 4th recall in a year and a half, and this one looks rather serious. Anyone have this "condition"? Anyone take theirs in yet for this service? Love the car, terrific ride, but beginning to worry a bit. Dragan