The 5 Series sports BMW's now-familiar corporate design themes, introduced on the larger 7 Series sedan and subsequently applied to the smaller 3 Series. BMW's new approach to styling has been discussed as frequently as any in the car world, and more than occasionally criticized. On the 5 Series at least, the curvy front-end, flat sides and high rear deck stand out less than they once did. That may simply mean we've grown more familiar with the shape, rather than more appreciative.

The critics contend that, with the flared-nostrils look in front and the chunked-off shape of the trunk lid, the 5 Series seems almost like two halves taken from different cars. In our view, the lines create a fairly compact appearance, and that may be part of the problem. The 5 has the appearance of a well-built mainstream sedan, and that may not be the precedent one expects for an expensive European job. In any case, the look doesn't seem to have hurt 5 Series sales.

The comma-shaped, wraparound taillights apply a technology introduced by BMW that has spread to a number of makes. The company calls them adaptive brake lights, and they illuminate more intensely, over a larger area, when the anti-lock brake system engages, in other words when the driver is braking as hard as possible. The point is to inform drivers following that it's stopping quickly, possibly in an emergency situation. It could help, if the driver following correctly interprets the increased intensity of the brake lights.

BMW re-introduced a 5 Series wagon for 2006. The big difference, of course, lies behind the rear roof pillars and back seats, where the 5 Series Sport Wagons offer more load-carrying potential and versatility than the sedan. The rear gate opens electrically, with a switch on the key fob or dashboard, and swings very high for easy access to the load floor. A big reflector on the bottom of the gate adds an element of safety in darkness.

The lift gate has a soft-close feature. When it's lowered, it automatically sucks itself shut, no slamming required. The glass window opens separately, which is convenient when dropping a briefcase or a couple of bags in back.

New for 2007: Xenon adaptive headlights are now standard on the 530i and above. The xenon high-intensity discharge headlights offer a brighter, more intense, more white light that appears blue when we're used to seeing halogen lights with a warmer, relatively yellow light. Adaptive means the lenses turn slightly with the steering, throwing light around a curve in the direction of travel.