The 2008 Mercedes-Benz M-Class gets an 80-hp boost for one of its available V8 engines. The M-Class seats five and has all-wheel drive without low-range gearing. It comes in four models. The ML350 has a 3.5-liter 268-hp V6. The ML320 CDI has a 3.0-liter 215-hp turbodiesel V6. Replacing the ML500 and its 5.0-liter 302-hp V8 for '08 is the ML550 with a 5.5-liter 382-hp V8. Topping the line is the high-performance ML63 with its 6.2-liter 503-hp V8. All M-Class models have a 7-speed automatic transmission. Maximum towing capacity is 7200 lb. Available safety features include ABS, traction control, antiskid system, front and rear side airbags, and curtain side airbags with rollover deployment. All have a 60/40 split folding rear seat, wood interior trim, and Mercedes' Tele Aid assistance system. The ML63 retains 20-inch wheels, but wheel diameter on all other models increases to 19 inches from 17 or 18. Among features standard on the ML63 and optional on other models are leather upholstery, navigation system, rearview camera, and power liftgate. Steering-linked xenon headlamps and adaptive cruise control are also available. For '08, the ML550 gains an AMG appearance package that's similar to what's standard on the ML63.