Mercedes-Benz is no stranger to diesel engines. The German automaker built one of its first diesel engines for the Mercedes-Benz 260 D, which entered production way back in 1936. This four-cylinder diesel engine produced 45 horsepower and achieved a top speed of 59 mph. Fast-forward more than 80 years, and Mercedes-Benz now features a wide variety of vehicles in its portfolio that use diesel power. The latest to receive the diesel treatment is the 2013 Mercedes-Benz GLK250 BlueTEC 4MATIC. Behind that mouthful of a name is a 2.1-liter four-cylinder biturbo diesel engine rated at 200 horsepower -- a slight step up from 1936 -- and 369 pound-feet of torque. Diesel engines provide immediate power without digging too deep into fuel economy, something gas-powered engines have yet to do on a consistent basis, but still lack the popularity its octane-drinking brethren possess in the United States. We took the 2013 Mercedes-Benz GLK250 BlueTEC 4MATIC out for a spin to see if this reputation would change anytime soon. Here's what we found.