The GTS's star attraction is its torque-rich 4.8-liter V8, the same dry-sump, alloy-block engine as in the all-wheel-drive Panamera 4S but let off the leash a bit, with a higher redline (7, 100-rpm fuel shut-off), lumpier cam-lift logic, more aggressive transmission software (quicker, harder shifts available from the dual-clutch PDK gearbox), and additional cold-air boxes with active shutters behind lower lateral bumper intakes.

WSJ: 2013 Porsche Panamera GTS Review: The Car for Today's Jay Gatsbys? | Rumble Seat by Dan Neil

United mechanics who inspected the engine found that two shop towels had been used to cover openings in the oil sump area, instead of protective caps.

CNN: US Airways, United face FAA fines for safety violations