MONEYTest DriveThe 2013 Mercedes-Benz GLK250 BlueTEC The GLK isn't new to the lineup, but did get styling and other updates for 2013, as well as the awaited diesel four-banger that joined in April.Mercedes-Benz Via WieckA refreshed interior sports a 5.8-inch color-LCD display and a central controller on the console.Mercedes-Benz Via WieckThis SUV is small, funky-looking and now sports the first four-cylinder diesel that Mercedes-Benz has sold in the U.S. since the early 1980s.Jonathan Harper, USA TODAYThe 2.1 liter diesel engine has 200 horsepower and a generous 369 pounds-feet of torque.Mercedes-Benz Via WieckA newly designed interior has a power steering column, an optional full leather seating package is available as well.Mercedes-Benz Via WieckThe electronic gearshift lever, usually among the worst features in a modern vehicle, works quite nicely.Jonathan Harper, USA TODAYThe GLK isn't new to the lineup, but did get styling and other updates for 2013 including new wheels.Jonathan Harper, USA TODAYThe 2013 GLK also includes new bumper design, mirrors, lights, and interior trim.Jonathan Harper, USA TODAYThe 2013 GLK starts at $38,590.Mercedes-Benz, Via WieckAlthough the 2013 GLK refresh doesn't off much new aesthetically, the diesel engine is a notable improvement.Jonathan Harper, USA TODAYFeatured Weekly Ad