The Mercedes-Benz GLK 350 BlueEFFICIENCY 4MATIC, produced from 2011 to 2012, represented a key offering within the X204 GLK series. Positioned as a mid-range trim, it bridged the gap between the base GLK 250 and the performance-oriented GLK 55 AMG. This variant aimed to deliver a balance of luxury, capability, and reasonable fuel efficiency within the compact luxury SUV segment. It was primarily marketed towards buyers seeking a versatile vehicle for both daily commuting and weekend adventures, offering the prestige of the Mercedes-Benz brand with all-wheel drive capability.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLK |
| Generation | GLK (X204) |
| Type | GLK 350 BlueEFFICIENCY V6 (306 Hp) 4MATIC 7G-TRONIC PLUS |
| Start of production | 2011 |
| End of production | 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 10.5-11 l/100 km (22.4 – 21.4 US mpg) |
| Fuel consumption (extra urban) | 6.9-7.4 l/100 km (34.1 – 31.8 US mpg) |
| Fuel consumption (combined) | 8.2-8.7 l/100 km (28.7 – 27 US mpg) |
| CO2 emissions | 194-203 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.5 sec |
| Acceleration 0 – 62 mph | 6.5 sec |
| Acceleration 0 – 60 mph | 6.2 sec |
| Maximum speed | 238 km/h (147.89 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 5.8 kg/Hp |
| Weight-to-torque ratio | 4.8 kg/Nm |
| Power | 306 Hp @ 6500 rpm |
| Torque | 370 Nm @ 3500-5250 rpm (272.9 lb.-ft. @ 3500-5250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 276.957 |
| Engine displacement | 3498 cm3 (213.46 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 92.9 mm (3.66 in.) |
| Piston Stroke | 86 mm (3.39 in.) |
| Compression ratio | 10.7:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated |
| 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 | 2415 kg (5324.16 lbs.) |
| Max load | 645 kg (1421.98 lbs.) |
| Trunk (boot) space (minimum) | 450 l (15.89 cu. ft.) |
| Trunk (boot) space (maximum) | 1550 l (54.74 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load (braked) | 2000 kg (4409.25 lbs.) |
| Permitted trailer load (unbraked) | 750 kg (1653.47 lbs.) |
| Length | 4525 mm (178.15 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 | 1588 mm (62.52 in.) |
| Ride height (ground clearance) | 201 mm (7.91 in.) |
| Drag coefficient (Cd) | 0.36 |
| Minimum turning circle | 11.5 m (37.73 ft.) |
| Front suspension | Independent, McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Gearbox | 7 gears, automatic transmission G-TRONIC PLUS |
INTRODUCTION
The GLK 350 BlueEFFICIENCY, launched in 2011 as part of the X204 GLK facelift, offered a significant upgrade over the earlier GLK 300 models. Built on the W204 C-Class platform (specifically the 204.0 chassis code), the GLK aimed to provide a more compact and user-friendly alternative to the larger ML-Class SUV. The “BlueEFFICIENCY” designation indicated Mercedes-Benz’s efforts to improve fuel economy through various technologies, including optimized aerodynamics and engine management. This model year saw refinements to both the exterior styling and interior appointments, solidifying the GLK’s position as a competitive offering in the burgeoning luxury crossover market.
Powertrain & Engine Architecture
At the heart of the GLK 350 BlueEFFICIENCY lies the M276.957 3.5-liter naturally aspirated V6 engine. This engine, a cornerstone of Mercedes-Benz’s powertrain lineup during this period, features a 60-degree V-angle and utilizes direct fuel injection. The direct injection system, coupled with a variable valve timing system (DOHC), optimizes combustion efficiency and contributes to the engine’s responsive power delivery. The engine produces 306 horsepower at 6500 rpm and 273 lb-ft of torque between 3500 and 5250 rpm. Paired with this engine is the 7G-TRONIC PLUS seven-speed automatic transmission, known for its smooth shifting and efficiency. This transmission features a torque converter lock-up clutch that minimizes slippage and improves fuel economy. The 4MATIC all-wheel-drive system distributes power between the front and rear axles as needed, enhancing traction and stability in various driving conditions.
Driving Characteristics
The GLK 350 BlueEFFICIENCY’s driving experience is characterized by a blend of comfort and capability. The 306-hp V6 provides ample power for everyday driving and confident highway passing. While not a sports SUV, the GLK 350 delivers brisk acceleration, achieving 0-60 mph in approximately 6.2 seconds. The 7G-TRONIC transmission contributes to a refined driving experience, offering seamless gear changes. Compared to the base GLK 250, the 350 offers a noticeable performance advantage, particularly in situations requiring quick acceleration or merging onto highways. The all-wheel-drive system provides enhanced grip and stability, especially in inclement weather. However, the GLK 350 doesn’t possess the sporty handling characteristics of some competitors, prioritizing ride comfort over outright agility.
Equipment & Trim Levels
The GLK 350 BlueEFFICIENCY came standard with a generous array of features, including leatherette upholstery, dual-zone automatic climate control, a power liftgate, and a rearview camera. Optional extras included genuine leather upholstery, a premium sound system, navigation system, and a panoramic sunroof. The interior design was generally considered upscale and well-appointed, though it lacked some of the cutting-edge technology found in newer luxury SUVs. Trim levels were relatively straightforward, with most options available as standalone additions rather than distinct packages.
Chassis & Braking
The GLK 350 utilizes a McPherson strut front suspension and a multi-link independent rear suspension. This setup provides a comfortable ride while maintaining reasonable handling characteristics. Stabilizer bars are fitted to both axles to reduce body roll during cornering. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Anti-lock brakes (ABS) and electronic stability control (ESP) are standard safety features. The GLK 350’s ride height of 7.91 inches provides adequate ground clearance for light off-road use, though it’s primarily designed for on-road driving.
Market Reception & Comparison
The GLK 350 BlueEFFICIENCY was generally well-received by automotive critics, who praised its comfortable ride, spacious interior, and refined powertrain. However, some reviewers noted that its handling wasn’t as sporty as some competitors, such as the BMW X3 or Audi Q5. Compared to the GLK 250, the 350 offered a significant performance upgrade, justifying the higher price tag for buyers prioritizing power and acceleration. Fuel economy was respectable for its class, though not class-leading. Reliability reports suggest that the M276 engine is generally durable, but routine maintenance is crucial to prevent potential issues.
Legacy
The GLK 350 BlueEFFICIENCY remains a popular choice in the used car market, offering a compelling combination of luxury, practicality, and reliability. The M276 V6 engine has proven to be a robust and long-lasting powertrain, provided it receives regular maintenance. While newer SUVs offer more advanced technology and features, the GLK 350 continues to appeal to buyers seeking a well-built and comfortable luxury crossover at a reasonable price point. Its relatively simple design and proven mechanicals make it a potentially attractive option for those seeking a dependable and relatively easy-to-maintain vehicle.
