X3 is somewhat smaller than most like-priced SUVs. It slots below BMW's larger, costlier X5, but has near-identical passenger space, more cargo volume, and is some 600 lb lighter. Like X5, the X3 seats five, has a liftgate with fixed glass, and includes BMW's xDrive all-wheel drive. Inline 6-cyl engines power two models: a 184-hp 2.5i and a 225-hp 3.0i. Both offer 6-speed manual transmission or optional 5-speed automatic with manual shift gate. Despite eight inches of ground clearance, X3 is intended only for light-duty off-roading. The AWD lacks low-range gearing, but includes a hill descent control that automatically limits speed down steep grades. ABS and antiskid/traction control are standard. So are front side airbags and head-protecting tubular side airbags; rear torso side airbags are optional. Standard wheels are 17-inchers, but 18s are available in a Sport Package that also includes firmer suspension and sport front seats. The 3.0 also offers the 18s with "summer" performance tires. Leather upholstery is available for both models, as are dual sunroofs with a sliding front panel and rear glass skylight. Other options include navigation system, steering-linked xenon headlamps, and front/rear obstacle detection.