New diesel and high-performance models highlight 2007 for the smaller of Mercedes' two midsize SUVs. The M-Class seats five and comes in four models. The ML350 has a 268-hp V6. The ML500 has a 302-hp V8. Added for '07 are the ML320 CDI with a 215-hp turbodiesel V6, and the high-performance ML63 with a 503-hp V8. A 7-speed automatic is the sole transmission. All MLs have all-wheel drive without low-range gearing. ABS and traction/antiskid control are standard. So are front and rear side airbags and curtain side airbags. All MLs have a 60/40 split folding rear seat, wood interior trim, and Mercedes' Tele Aid assistance system. Leather upholstery is standard on the ML63, optional on the other models. A navigation system and steering-linked xenon headlamps are available.