For 2007 the X5 is all new with a revised chassis, more powerful and fuel efficient engines and a more responsive 6-speed automatic transmission. Redesigned to be longer, wider and taller than its predecessor, the X5 now offers available 7-passenger seating, increased interior room and a host of new features including standard 18-inch wheels and tires on the 3.0si, a tire-pressure monitor, new occupant-detection sensor in front passenger seat and new-type rear differential