Under the hood, a 3-liter V6 diesel engine produces 210 horsepower and a whopping 455 pound-feet of torque. This engine incorporates an oxidizing catalytic converter, a particulate filter, an SCR converter and a NOx storage system to keep harmful emissions as low as possible. Fortunately, all this eco-friendliness doesn't interfere with the sedan's mileage ratings of 21 mpg city and 31 mpg highway, or its respectable 7-second sprint to 60 mph.
A seven-speed automatic transmission features two overdrive ratios—these keep cruising rpm low and enhance peak highway fuel economy. A paddle-shift interface involves the driver in the shifting process when desired. And standard 4MATIC all-wheel drive provides excellent traction.