The Mercedes-Benz GLK 250 CDI BlueEFFICIENCY 4MATIC, produced between 2009 and 2011, was a diesel-powered variant of the first-generation GLK (X204) compact luxury SUV. Positioned as a mid-range offering within the GLK lineup, it aimed to balance fuel efficiency with respectable performance and the added security of all-wheel drive. This model played a significant role in establishing the GLK as a competitor in the burgeoning compact SUV segment, particularly in European markets where diesel engines were highly favored. It offered a more economical alternative to the gasoline-powered GLK 350, while still providing the luxury and features expected of the Mercedes-Benz brand.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLK |
| Generation | GLK (X204) |
| Type | GLK 250 CDI BlueEFFICIENCY (204 Hp) 4MATIC 7G-TRONIC |
| Start of production | 2009 |
| End of production | 2011 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 8.4-8.7 l/100 km (28 – 27 US mpg) |
| Fuel consumption (extra urban) | 5.7-6 l/100 km (41.3 – 39.2 US mpg) |
| Fuel consumption (combined) | 6.7-7 l/100 km (35.1 – 33.6 US mpg) |
| CO2 emissions | 176-183 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.9 sec |
| Acceleration 0 – 62 mph | 7.9 sec |
| Acceleration 0 – 60 mph | 7.5 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 8.7 kg/Hp |
| Weight-to-torque ratio | 3.5 kg/Nm |
| Power | 204 Hp @ 4200 rpm |
| Torque | 500 Nm @ 1600-1800 rpm (368.78 lb.-ft. @ 1600-1800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 651.912 |
| Engine displacement | 2143 cm3 (130.77 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 99 mm (3.9 in.) |
| Compression ratio | 16.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | BiTurbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Kerb Weight | 1770 kg (3902.18 lbs.) |
| Max. weight | 2440 kg (5379.28 lbs.) |
| Max load | 670 kg (1477.1 lbs.) |
| Trunk (boot) space – minimum | 450 l (15.89 cu. ft.) |
| Trunk (boot) space – maximum | 1550 l (54.74 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal | 12.98 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 2000 kg (4409.25 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4528 mm (178.27 in.) |
| Width | 1840 mm (72.44 in.) |
| Width including mirrors | 2016 mm (79.37 in.) |
| Height | 1689 mm (66.5 in.) |
| Wheelbase | 2755 mm (108.46 in.) |
| Front track | 1567 mm (61.69 in.) |
| Rear track | 1569 mm (61.77 in.) |
| Front overhang | 816 mm (32.13 in.) |
| Rear overhang | 957 mm (37.68 in.) |
| Ride height (ground clearance) | 201 mm (7.91 in.) |
| Drag coefficient (Cd) | 0.34 |
| Minimum turning circle | 11.5 m (37.73 ft.) |
| Front brakes | Ventilated discs, 330×32 mm |
| Rear brakes | Ventilated discs, 300×22 mm |
| Number of gears | 7 |
| Gearbox type | automatic transmission G-TRONIC |
INTRODUCTION
The Mercedes-Benz GLK 250 CDI BlueEFFICIENCY 4MATIC, launched in 2009 as part of the X204 GLK series, represented a key offering in the compact luxury SUV segment. Built on the W204 C-Class platform, the GLK aimed to provide a more accessible entry point into the Mercedes-Benz SUV range. The “BlueEFFICIENCY” designation signified Mercedes-Benz’s commitment to improving fuel economy and reducing emissions through various technologies. The 250 CDI variant, with its 2.1-liter turbocharged diesel engine, was particularly popular in Europe, where diesel fuel was more prevalent and often subject to favorable taxation. It served as a bridge between the base GLK models and the more powerful GLK 350.
Powertrain & Engine Architecture
At the heart of the GLK 250 CDI was the OM 651.912, a 2.1-liter inline-four cylinder diesel engine. This engine was a highly advanced design for its time, featuring common-rail direct injection and a sophisticated two-stage turbocharging system. The first turbocharger was a variable geometry turbo (VGT) responsible for quick response at lower engine speeds, while the second, smaller turbocharger provided increased boost at higher RPMs, contributing to the engine’s 500 Nm (368.78 lb.-ft.) of torque. The engine also incorporated an intercooler to further enhance performance. The high compression ratio of 16.2:1 was typical for diesel engines, maximizing efficiency. The 7G-TRONIC automatic transmission, a seven-speed unit, was standard, offering smooth and efficient gear changes. This transmission was known for its adaptability and contributed to the vehicle’s refined driving experience.
Driving Characteristics
The GLK 250 CDI 4MATIC offered a comfortable and capable driving experience. While not as overtly sporty as the GLK 350, the 204 horsepower and 368 lb-ft of torque provided ample power for everyday driving and highway cruising. The 7G-TRONIC transmission was well-matched to the engine, providing smooth upshifts and downshifts. The 0-60 mph time of around 7.5 seconds was respectable for a diesel-powered SUV. The all-wheel-drive system (4MATIC) provided enhanced traction in various weather conditions. Compared to the manual transmission options available in some markets, the automatic offered greater convenience, though potentially at a slight cost to fuel economy. The engine’s torque curve was broad, making it easy to accelerate from low speeds without needing to downshift frequently.
Equipment & Trim Levels
The GLK 250 CDI BlueEFFICIENCY 4MATIC typically came well-equipped, reflecting its luxury positioning. Standard features included automatic climate control, power windows and locks, a multi-function steering wheel, and a premium audio system. Upholstery was typically MB-Tex artificial leather, with optional genuine leather available. Common optional extras included a sunroof, navigation system, parking sensors, and upgraded wheels. The “BlueEFFICIENCY” package included features designed to improve fuel economy, such as optimized aerodynamics and low-rolling-resistance tires. Interior trim options varied, allowing buyers to personalize the vehicle to their preferences.
Chassis & Braking
The GLK 250 CDI utilized an independent suspension system, with McPherson struts at the front and a multi-link setup at the rear. This configuration provided a comfortable ride and good handling characteristics. Stabilizer bars were fitted to both axles to reduce body roll during cornering. The braking system consisted of ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESP) were standard safety features. The GLK’s relatively high ground clearance of 201 mm (7.91 in.) allowed for some light off-road capability, although it was primarily designed for on-road use.
Market Reception & Comparison
The GLK 250 CDI BlueEFFICIENCY 4MATIC was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and refined interior. However, some reviewers noted that the engine could be somewhat noisy compared to gasoline engines. Compared to the GLK 350, the 250 CDI offered significantly better fuel economy, making it a more practical choice for drivers who prioritized efficiency. The 250 CDI also undercut the 350 in price, making it a more accessible option. Against competitors like the BMW X3 and Audi Q5, the GLK 250 CDI offered a compelling combination of luxury, fuel economy, and all-wheel-drive capability.
Legacy
The OM 651 engine family, used in the GLK 250 CDI, proved to be remarkably durable and reliable. These engines are known for their longevity, and well-maintained examples can accumulate high mileage without major issues. On the used car market, the GLK 250 CDI 4MATIC remains a popular choice, particularly for buyers seeking a fuel-efficient and reliable luxury SUV. While newer SUVs offer more advanced technology and features, the X204 GLK 250 CDI continues to represent a solid value proposition, offering a blend of Mercedes-Benz quality and practicality. Common maintenance items include regular oil changes, filter replacements, and occasional attention to the turbocharger system.
