2013 Mercedes-Benz GLK250 Bluetec: Is diesel really a cure-all? Published on May 3, 2013 in First Drives by Alain Morin Photo: Alain Morin Initially, the 2013 GLK 250 was slated to come to North America at the end of 2012. But in the end, it didn’t arrive to dealerships until the end of April.