The power unit under the hood of the potential GLK - the main distinguishing feature on the way from the car to car, as any copy for the U.S. necessarily meant a four-wheel-drive (4 Matic) and seven-speed "automatic" 7 G-Tronic (although the native European versions GLK 200 and 220 CDI could have a "manual" box and drive only on the rear axle).
At first sight, in a variety of versions, it is easy to drown. But in fact, everything is simpler. Mercedes-Benz likes to vary the output of engines using firmware, selecting new indices at the same time. Thus, the "iron" of power units is often the same. And it turns out that the only engine is for a pair of modifications.
The GLK does not have openly problematic engines. But it is not necessary to count on cloudless existence. On before-restyling crossovers GLK 220 CDI, the fuel injectors are changed, and the engine control's electronic block is re-flashed. However, don't hurry up to be frightened of such a significant procedure. This difficult operation has the status of a service campaign and is free for the car owner. Alas, they do not always call for replacement, but if you visit the dealer of your own free will, as a rule, they do not refuse.