The X5 is a luxuriousSUV sold by BMW. It is based on the E39BMW 5-Series, and features all wheel drive and a line of strong straight-6 and V8 engines. The Diesel X5 is not offered in the United States. The X5 has been criticized for having low interior volume considering its size. In fact, the smaller BMW X3 has as much interior volume, and the 5-Series touring has more.