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The 2008 Mercedes M-Class includes four models. Each is equipped with a seven-speed automatic transmission and electronically managed 4ETS fulltime all-wheel drive. The primary distinguishing feature for each model is its engine.

The ML350 ($43,650) is powered by the latest-generation Mercedes 3.5-liter V6, generating 268 horsepower. It comes with vinyl upholstery, automatic headlights, power seats, sunroof, 19-inch wheels and an eight-speaker stereo with CD.

The ML320CDI ($44,650) is equipped similarly but with the 215-hp 3.0-liter diesel V6 rated at 398 pound-feet of torque.

The ML550 ($52,400) gets the latest four-valve 382-hp V8 and more standard features. These include heated, leather covered front seats, walnut burl trim, rain-sensing wipers and Tele-Aid emergency communication. The ML550 also includes more potent brakes and AMG front styling.

The ML63 AMG ($86,650) features a 6.2-liter V8 that generates 503 hp along with an AMG transmission, AMG shocks and suspension tuning, high-performance P295/40ZR20 tires on 20-inch wheels, AMG brakes, an air dam and other aerodynamic aids, AMG instruments, harman/kardon Logic7 CD6 audio with 12 speakers, and leather upholstery.

Options include Distronic radar-managed cruise control ($2,200), Parktronic obstacle warning ($770), dual-screen rear-seat DVD entertainment system ($2,670), Keyless Go starting ($1,100), iPod integration kit ($375), CD6 changer ($450). Three packages are available, designated Premium I that includes DVD navigation ($3,650), PII ($5,550), and PIII ($8,500), with exact content tied to the model. Last year's AMG Sport Package ($4,550) is standard on M-Class V8s.

Safety features on all models includes two-stage front airbags for the driver and front passenger, side-impact airbags front and rear (torso protection) and curtain-style head protection airbags. A rollover sensor can activate both the seat-belt tensioners and curtain airbags if the vehicle senses an imminent rollover. An Electronic Stability Program comes standard along with advanced anti-lock brakes with electronic brake-force distribution. A tire pressure warning system is also standard.