When the repair bills for my trusty old 2003 Mitsubishi Outlander started to outweigh the car’s actual value, I knew it was time to find a worthy successor – the “Keithmobile-E” needed replacing. My criteria were simple: I wanted something similar to my Outlander, but newer and perhaps a touch more refined. This naturally led me to the popular “compact SUV/crossover” category, a segment brimming with options these days.
I spent considerable time exploring vehicles across various model years, aiming for something used but not too old. After extensive research and test drives, I narrowed my choices down to two finalists – one of which I previously reviewed, and the other, the vehicle that ultimately won me over: a 2014 Mercedes-Benz GLK 250.
Mercedes-Benz GLK 250 badge highlighting the model and engine type, a key differentiator for this diesel SUV.
It’s almost stating the obvious to say the Mercedes-Benz GLK 250 exudes quality in every aspect. Stepping inside, the interior is undeniably a comfortable and premium space. Everything feels meticulously crafted, thoughtfully arranged, and built to last. My particular model came equipped with the kind of sophisticated features you’d expect from a Mercedes, and while many of these are becoming increasingly common in new vehicles, they felt refreshingly modern and exciting to me, a significant upgrade from my older car’s bare-bones setup.
Visibility from the driver’s seat of the GLK 250 is also commendable, especially for an SUV of this type. It’s certainly no worse than my previous Outlander. While a rear-view camera is present and helpful, it’s entirely possible to maneuver the GLK in reverse without relying solely on it, avoiding that unsettling guessing game of blind spots.
In terms of size, the GLK is surprisingly similar to my Outlander. Despite appearing larger, it’s almost identical in length, nearly the same height, and only an inch wider. This meant it slotted perfectly into my garage parking space, a very practical advantage.
Technologically, the GLK boasts a user-friendly media system with conveniently placed physical buttons for mode switching – a feature I greatly appreciate and one that’s surprisingly absent in some modern cars relying solely on touchscreens. The integrated navigation system is functional and gets the job done, though it’s not particularly cutting-edge.
The Heart of the Matter: The Diesel Engine
But let’s be honest, the real draw for me, and likely for many considering a Mercedes-Benz GLK 250, is what lies under the hood: the engine. The GLK class comes in two main variants: the 350 and the 250. The GLK 350 features a 3.5-liter V6 gasoline engine, while the GLK 250 is powered by a diesel – specifically, a 2.1-liter twin-turbo inline-4, producing a solid 200 horsepower and a remarkable 369 lb-ft of torque.
This potent diesel engine was the decisive factor in my choice.
I test drove both the GLK 350 and the GLK 250 before making my decision. While the 350’s engine delivered ample power, I found it somewhat challenging to manage smoothly. The throttle response in the GLK 350 felt a bit abrupt, almost unresponsive initially before suddenly surging with power, making precise modulation, especially at lower speeds, difficult.
In contrast, the Mercedes-Benz GLK 250 diesel engine delivers its power in a much more refined and predictable manner. Crucially, a significant portion of that impressive torque is available at lower RPMs – a characteristic trait of diesel engines and reminiscent of the power delivery in my old Outlander, where power was readily accessible without needing to rev the engine high.
This abundance of low-end torque from the diesel engine also enhances towing capability. The GLK 250 is no slouch in this department either, boasting a maximum trailer weight of 3,500 lbs – considerably more than my previous Outlander could handle.
Performance and Driving Dynamics
Even with what might seem like modest horsepower figures for a vehicle weighing around 4,246 lbs, the GLK 250 accelerates with surprising eagerness. There’s a slight pause just off the line, but the smaller of the two turbochargers spools up rapidly, and power delivery becomes remarkably even and consistent thereafter. It might not be the absolute quickest SUV on the road – in some ways, it feels faster than the stopwatch might indicate – but it’s certainly no slowcoach. Acceleration is smooth, steady, and feels almost relentless.
Even at highway speeds, power is always readily available. A simple press of the accelerator results in effortless forward motion, and you’ll quickly find yourself exceeding your intended speed if you’re not careful.
All this power is channeled to the wheels through a 7-speed automatic transmission that I can only describe as “buttery smooth.” In normal driving conditions, gear changes are almost imperceptible. The transmission also shifts gears quickly and responsively, and unlike many modern automatics, it doesn’t hesitate to downshift or upshift when commanded. A clever feature is its ability to automatically downshift when descending hills to assist with braking – a feature I’ve not encountered in other automatic gearboxes.
Of course, the Mercedes-Benz GLK 250 also features Mercedes’ renowned 4MATIC all-wheel-drive system. This ensures excellent traction and stability, even in slippery conditions, effectively putting all that diesel power to good use.
The engine incorporates variable valve control, but power delivery remains consistently smooth and linear throughout the rev range, without any sudden surges or peaks once the turbocharger is spooled up.
Fuel Efficiency and Comfort
Remarkably, despite its robust AWD system and somewhat boxy aerodynamic profile, the GLK 250 achieves impressive fuel economy figures of 24 mpg in the city and 33 mpg on the highway. In real-world driving, I’ve even seen slightly better numbers. Combined with a 17.4-gallon fuel tank, the GLK 250 offers an exceptional cruising range, making it ideal for long journeys.
Adding to its long-distance appeal, the GLK 250 provides a supremely comfortable ride. The suspension effectively absorbs bumps and imperfections in the road surface without feeling overly soft or disconnected, which can sometimes be the case with overly plush suspensions. It strikes a perfect balance – supple enough to handle rough roads comfortably, yet firm enough to inspire confidence when tackling corners in this relatively heavy SUV.
Having driven several diesel vehicles previously – including an Audi A4 wagon and a Fiat 500L – I can attest that diesel engines do require a slight adjustment in driving style, especially if you’re primarily accustomed to naturally aspirated gasoline engines. With diesels, the majority of the power is concentrated lower in the rev range, eliminating the need for high-revving driving. The addition of turbochargers further enhances this low-end torque delivery. While these cars might not be outright speed demons in terms of raw numbers, they certainly feel quick and responsive in everyday driving situations.
In an SUV application like the Mercedes-Benz GLK 250, a diesel engine seems particularly well-suited. It provides the necessary torque to move a heavier SUV with ease, while remaining relatively fuel-efficient. It’s a shame diesel SUVs aren’t more prevalent, particularly in the US market.
Minor Drawbacks to Consider
The Mercedes-Benz GLK 250 isn’t without its minor shortcomings, though none were significant enough to deter me from my purchase. However, your priorities might differ.
The most notable drawback is the somewhat limited rear seat legroom. As mentioned earlier, the GLK is the same overall length as my old Outlander, but the GLK features a larger engine compartment. This extra space had to come from somewhere, and in this case, it was carved out of the rear passenger area. While not excessively cramped, rear legroom isn’t particularly generous, especially if the front seats are pushed far back. For me, this wasn’t a major concern as I rarely have rear passengers, and I don’t position my seat excessively far back. However, for those who frequently transport more than two people, this could be a significant consideration.
Adding to the rear passenger experience, the rear wheel arches intrude into the rear door openings more than ideal, making ingress and egress to the back seats a little less graceful at times. It’s not overly difficult, but it’s noticeable. Passengers with mobility issues might find getting in and out of the GLK 250’s rear seats less than convenient.
Another minor quirk is the relocation of the transmission lever to the steering wheel column in later GLK models. It’s not like the clunky column shifters of older cars, but it does require a period of acclimatization. More than once, I instinctively reached for a gear lever in the center console before remembering it’s now a small stalk on the steering column.
Final Verdict: A Compelling Diesel SUV
Overall, I believe the Mercedes-Benz GLK 250 is a truly fantastic compact SUV. The diesel engine injects a fun-to-drive character, and despite its luxurious comfort, it retains a practical level of “utility.” If you’re in the market for a smaller SUV with a blend of style, comfort, and fuel efficiency, the Mercedes-Benz GLK 250 is definitely worth a serious look, especially in the used car market where it represents excellent value.
