ck1246 
2007 BMW 5 Series Sedan 550i 4dr Sedan (4.8L 8cyl 6M)
550i-The Ultimate Driving Machine 
 Bought the car used with 39k miles. It is a nicely refined German beast. Super fast and equally comfortable. But you must pay the cost to own such a machine. The 550i takes 8 1/2 quarts of full synthetic, which will run you around 110 bucks at the dealer. Breaks and tires are not cheap on the vehicle. I paid 800 bucks for the front two break pads/rotors. Had an electronic issue with the transmission at about 70k miles but the dealership covered it. If you are prepared to shell out money to maintain it, then I think you will enjoy this car. It is a dream to drive and the i-drive is easy to use although finicky at times. The dealership has been great and supply a new loaner free every time. 