The BMW 5 Series is more than a luxury sedan. It is also a station-wagon! The two versions fair rather well in a market occupied, among others, by the Audi A6, Cadillac CTS, Mercedes-Benz Classe E, and Volvo S60. Set to be completely overhauled, the 5 Series still offers an all-wheel drive system on some models. They come equipped with one of four engines, producing 230 to 500 horsepower for the M5, a monster propelled by a 5.0-litre V10 engine.