Mercedes-Benz's now-legendary M-Class SUV has been revised for the 2009 model year and beyond. While the refresh doesn't completely alter the look of the vehicle, it does include a redesigned bumper, recontoured headlamps and a larger radiator.

Since the Tuscaloosa, Alabama-built M-Class' introduction in late 1997 for the 1998 model year, families across the globe have flocked to the three-row sports-utility vehicle. The latest generation of the M brought a new top-end V8 model, the ML550, and considerably more aggressive style.

The visual changes with the latest update include restyled front and rear fascias, grille, headlights and smoked taillights. The interior receives upgraded materials along with a two-tone color scheme and new four-spoke steering wheel with integrated shift paddles. New standard and optional equipment has also been added.

Though quality woes plagued the initial vehicles, the M-Class has seen continued success. Since 2008, the ML550 replaces the ML500 and adds a 382 horsepower, 5.5 liter V8 engine. With 391 lb-ft. of torque and a seven-speed automatic transmission, the ML550 is a strong performer.

Sitting one notch below the ML550 in the lineup is the ML320 CDI, powered by a 215 horsepower turbodiesel V6. The ML320 CDI's diesel engine has an impressively flat torque curve that peaks at 398 lb-ft. With the seven-speed automatic, the ML320 is capable of up to 27 mpg on the highway, according to the EPA.

The entry-level ML-Class is the ML350, which is powered by Mercedes-Benz's ubiquitous 3.5-liter V6. It pumps out 268 horsepower and 258 lb-ft. of torque.

Standard equipment on all models includes vinyl upholstery, power front seats, 17" wheels, dual zone automatic climate control and wood interior trim. The ML550 adds hated front seats, an automatic-dimming rearview mirror and rain sensing wipers, as well as 18" wheels.

Other equipment includes Mercedes' own occupant protection systems, Pre-Safe and Neck-Pro head restraints, along with roof rails. A new multimedia interface system allows Bluetooth hands-free calling as well as an auxiliary connection for mobile music players. An optional Media Interface allows interacting with devices such as an iPod via the vehicle's steering wheel controls and displays.

MB engineers found a way to improve fuel economy of all M-class SUVs by about 1.5 mpg on average. All Ms feature a four-wheel drive system and a 7-speed automatic transmission and now sport twin exhaust tips. New wheel designs in 17 through to 20-inch sizes are standard or optionally available, with V8 models getting new 19-inch, 5-spoke alloys.

Major options include the premium package, which features a power sunroof, harman/kardon stereo with satellite radio, a power liftgate and, on ML320 CDI and ML350, rain sensing wipers. An additional premium package, P2, adds a navigation system and memory seats. A P3 premium package adds an load leveling suspension and active shock absorber control.

Newly optional are: a 12-speaker, 610W Harman Kardon Logic7 sound system and a rear-seat entertainment system with two 8-inch screens, a DVD player, two wireless headphones, and two remote controls. MB's Linguatronic voice-operated control system is another high-tech option.

An interior appearance package for all includes front sport seats covered in Alcantara, a faux suede, and aluminum interior trim. Dropped for 2008 is an AMG Sport package for all models.