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2008 BMW 5 Series Sedan 535xi 4dr Sedan AWD (3.0L 6cyl Turbo 6M)
Still going strong
 I have driven this car hard for a year and a half and have yet to go through any technical problems with the car. This car is tough as nails. The engine is extremely smooth, and the Sport mode is like attaching rockets to your car when you need it to pass someone on the highway.  The trunk is spacious, as is the rear seat, as two 6'2 guys have sat comfortably. The N54 engine (the TT L6) is easily one of the best BMW engines, and has won Engine of the Year awards consistently.  Has never been to the shop other than scheduled maintenance, despite being somewhat abused by a young driver with a lead foot for about 14,000 miles. Never had a problem starting in cold weather, and no malfunctions.