The ML500 retains the tried-and-true three-valve-per-cylinder, twin-spark 5.0-liter V8. It comes with a seven-speed automatic transmission (called the 7G-Tronic). All models also come with the next generation of Mercedes-Benz's full-time, brake-based 4ETS electronic all-wheel-drive and traction control system. Standard safety features include ABS, ESP stability control, traction control, two-stage adaptive airbags for the driver and front passenger, curtain side airbags and adaptive belt tensioners and belt force limiters for all seating positions. A rollover sensor can activate both the belt tensioner and curtain airbags if the vehicle senses an imminent rollover. A passive tire pressure warning system is also standard. For 2006, the Mercedes-Benz M-Class is fully redesigned.