| GLK 350 CDI V6 (231 CH) 4MATIC 7G-TRONIC | 169 kW (231 ch) | 209–220 g/km | 2987 cc | Diesel | 7 versnellingen Automatisch | Euro 5 |
| GLK 320 CDI V6 (224 CH) 4MATIC 7G-TRONIC | 164 kW (224 ch) | 208–220 g/km | 2987 cc | Diesel | 7 versnellingen Automatisch | Euro 4 |
| GLK 350 CDI V6 (224 CH) 4MATIC 7G-TRONIC | 164 kW (224 ch) | 208–220 g/km | 2987 cc | Diesel | 7 versnellingen Automatisch | Euro 4 |
| GLK 250 CDI BlueEFFICIENCY (204 CH) 4MATIC 7G-TRONIC | 150 kW (204 ch) | 176–183 g/km | 2143 cc | Diesel | 7 versnellingen Automatisch | Euro 5 |
| GLK 250 CDI BlueEFFICIENCY (204 CH) 4MATIC 7G-TRONIC PLUS | 150 kW (204 ch) | 159–168 g/km | 2143 cc | Diesel | 7 versnellingen Automatisch | Euro 5 |
| GLK 220 CDI BlueEFFICIENCY (170 CH) 4MATIC 7G-TRONIC | 125 kW (170 ch) | 176–182 g/km | 2143 cc | Diesel | 7 versnellingen Automatisch | Euro 5 |
| GLK 220 CDI BlueEFFICIENCY (170 CH) | 125 kW (170 ch) | 153–160 g/km | 2143 cc | Diesel | 6 versnellingen Handgeschakeld | Euro 5 |
| GLK 220 CDI BlueEFFICIENCY (170 CH) 7G-TRONIC | 125 kW (170 ch) | 164–174 g/km | 2143 cc | Diesel | 7 versnellingen Automatisch | Euro 5 |
| GLK 220 CDI BlueEFFICIENCY (170 CH) 4MATIC 7G-TRONIC PLUS | 125 kW (170 ch) | 159–168 g/km | 2143 cc | Diesel | 7 versnellingen Automatisch | Euro 5 |
| GLK 220 CDI BlueEFFICIENCY (170 CH) Start & Stop | 125 kW (170 ch) | 149–159 g/km | 2143 cc | Diesel | 6 versnellingen Handgeschakeld | Euro 5 |
| GLK 220 CDI BlueEFFICIENCY (170 CH) 7G-TRONIC PLUS | 125 kW (170 ch) | 145–156 g/km | 2143 cc | Diesel | 7 versnellingen Automatisch | Euro 5 |
| GLK 200 CDI BlueEFFICIENCY (143 CH) | 105 kW (143 ch) | 153–160 g/km | 2143 cc | Diesel | 6 versnellingen Handgeschakeld | Euro 5 |
| GLK 200 CDI BlueEFFICIENCY (143 CH) 7G-TRONIC | 105 kW (143 ch) | 164–174 g/km | 2143 cc | Diesel | 7 versnellingen Automatisch | Euro 5 |
| GLK 200 CDI BlueEFFICIENCY (143 CH) Start & Stop | 105 kW (143 ch) | 149–159 g/km | 2143 cc | Diesel | 6 versnellingen Handgeschakeld | Euro 5 |
| GLK 200 CDI BlueEFFICIENCY (143 CH) 7G-TRONIC PLUS | 105 kW (143 ch) | 145–156 g/km | 2143 cc | Diesel | 7 versnellingen Automatisch | Euro 5 |
| GLK 350 BlueEFFICIENCY V6 (306 CH) 4MATIC 7G-TRONIC PLUS | 225 kW (306 ch) | 194–203 g/km | 3498 cc | Benzine | 7 versnellingen Automatisch | Euro 5 |
| GLK 350 V6 (272 CH) 4MATIC 7G-TRONIC | 200 kW (272 ch) | 245–251 g/km | 3498 cc | Benzine | 7 versnellingen Automatisch | Euro 5 |
| GLK 350 V6 (268 CH) 7G-TRONIC | 197 kW (268 ch) | — | 3498 cc | Benzine | 7 versnellingen Automatisch | — |
| GLK 280 V6 (231 CH) 4MATIC 7G-TRONIC | 169 kW (231 ch) | 244–246 g/km | 2996 cc | Benzine | 7 versnellingen Automatisch | Euro 5 |
| GLK 300 V6 (231 CH) 4MATIC 7G-TRONIC | 169 kW (231 ch) | 239–246 g/km | 2996 cc | Benzine | 7 versnellingen Automatisch | Euro 5 |