The 3.0-liter diesel V-6 generates 240 hp, 30 more horsepower than the current engine. The diesel engine’s fuel economy has been improved 3 percent to 20 mpg in the city while highway mileage remains at 25 mpg, Mercedes said.
The gasoline V-6 gets a horsepower boost to 302 from 268 and fuel economy rises to 17 mpg city/22 highway from 15 city/20 highway.
A 4.6-liter V-8 will be offered later.
The current Mercedes M-class also is offered with a 5.5-liter gasoline V-8 engine and a gasoline-electric hybrid V-6 model with 335 hp.
The third-generation M-class shares components and engineering with the 2011 Jeep Grand Cherokee. Work on both vehicles started before Chrysler’s separation from Daimler AG.
The 2012 Mercedes M-class will feature a suspension with adaptive damping that activates on moderately uneven roads or slow, off-road driving to soften the ride.