Equipped with a seven-speed automatic transmission and electronically managed 4ETS all-wheel drive, the ML-class is available in four models. The ML320 CDI is powered by a 3.0-liter turbo-diesel V6 generating 215 horsepower. The ML350 is powered by Mercedes' latest-generation 3.5-liter gasoline V6, generating 268 horsepower. The ML550 uses an upgraded 5.5-liter, 382-hp V8 and the top of the line ML63 AMG uses a 6.3-liter, 503-hp V8. For 2008, the extensively equipped M-Class includes standard features such as stability control and active front head restraints, as well as front, side, and side curtain airbags.