The Mercedes-Benz GLK 350 4MATIC, produced from 2012 to 2015 as part of the X204 facelift generation, represented a significant offering in the burgeoning luxury compact SUV segment. Positioned as the premium engine option within the GLK lineup, it bridged the gap between the base GLK 250 and the performance-oriented AMG variant. This model combined a naturally aspirated 3.5-liter V6 engine with a seven-speed 7G-TRONIC PLUS automatic transmission and Mercedes’ 4MATIC all-wheel-drive system, aiming to deliver a balance of power, refinement, and all-weather capability. The X204 GLK was Mercedes-Benz’s first foray into the compact luxury SUV market, designed to appeal to buyers seeking a more manageable size and price point than the larger ML-Class.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLK |
| Generation | GLK (X204, facelift 2012) |
| Type | GLK 350 V6 (306 Hp) 4MATIC 7G-TRONIC PLUS |
| Start of production | 2012 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 10.3-10.5 l/100 km (22.8 – 22.4 US mpg) |
| Fuel consumption (extra urban) | 6.8-6.9 l/100 km (34.6 – 34.1 US mpg) |
| Fuel consumption (combined) | 8.1-8.2 l/100 km (29 – 28.7 US mpg) |
| CO2 emissions | 189-192 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 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 DE 35 |
| 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 | 12:1 |
| 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) |
| Coolant capacity | 9 l (9.51 US qt | 7.92 UK qt) |
| Kerb Weight | 1770 kg (3902.18 lbs.) |
| Max. weight | 2420 kg (5335.19 lbs.) |
| Max load | 650 kg (1433 lbs.) |
| Trunk space (min) | 450 l (15.89 cu. ft.) |
| Trunk space (max) | 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) | 2400 kg (5291.09 lbs.) |
| Permitted trailer load (unbraked) | 750 kg (1653.47 lbs.) |
| Length | 4536 mm (178.58 in.) |
| Width | 1840 mm (72.44 in.) |
| Width (with mirrors) | 2016 mm (79.37 in.) |
| Height | 1669 mm (65.71 in.) |
| Wheelbase | 2755 mm (108.46 in.) |
| Front track | 1574 mm (61.97 in.) |
| Rear track | 1597 mm (62.87 in.) |
| Drag coefficient (Cd) | 0.36 |
| Turning circle | 11.65 m (38.22 ft.) |
| Drivetrain | All wheel drive (4×4) |
| Gearbox | 7 gears, automatic transmission G-TRONIC PLUS |
| Front suspension | Independent type McPherson, Transverse stabilizer |
| Rear suspension | Independent multi-link suspension, Transverse stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
INTRODUCTION
The facelifted Mercedes-Benz GLK 350 4MATIC, introduced in 2012, represented a mid-cycle refresh of the X204 series. This update brought revised styling, enhanced interior features, and improvements to the powertrain. The GLK aimed to attract buyers who desired the prestige of a Mercedes-Benz SUV in a more compact and manageable package than the larger offerings. The 350 variant, with its V6 engine, served as the sweet spot in the lineup, offering a noticeable performance upgrade over the base 250 model without the significantly higher price tag of the AMG version. Production continued until 2015, when it was replaced by the GLC-Class.
Powertrain & Engine Architecture
At the heart of the GLK 350 4MATIC lies the M276 DE 35 engine, a 3.5-liter naturally aspirated V6. This engine utilizes direct fuel injection, a technology that improves both power and fuel efficiency by injecting fuel directly into the combustion chamber. The engine boasts a 12:1 compression ratio and a dual overhead camshaft (DOHC) valvetrain with four valves per cylinder. The M276 engine family is known for its smooth operation and relatively high power output for its displacement. Paired with the engine is the 7G-TRONIC PLUS seven-speed automatic transmission. This transmission is renowned for its smooth and quick shifts, contributing to a refined driving experience. The 7G-TRONIC PLUS features a torque converter lock-up clutch that engages in most driving situations, improving fuel economy. The 4MATIC all-wheel-drive system is full-time, distributing power to all four wheels for enhanced traction and stability, particularly in inclement weather.
Driving Characteristics
The GLK 350 4MATIC delivers a comfortable and capable driving experience. The 306 horsepower and 272.9 lb.-ft. of torque provide ample power for everyday driving and confident passing maneuvers. Acceleration from 0 to 60 mph takes approximately 6.2 seconds. While not a sports SUV, the GLK 350 feels responsive and well-balanced. The 7G-TRONIC PLUS transmission contributes to smooth acceleration and seamless gear changes. Compared to the GLK 250 with its turbocharged four-cylinder engine, the 350 offers a more linear power delivery and a more refined engine note. The 4MATIC system provides excellent grip in various conditions, enhancing stability and confidence. The steering is precise and well-weighted, although it lacks some of the feedback found in sportier SUVs. The ride quality is generally comfortable, absorbing most road imperfections without feeling overly soft.
Equipment & Trim Levels
The GLK 350 4MATIC came standard with a generous array of features, including leather upholstery, power-adjustable front seats with memory function, dual-zone automatic climate control, a premium sound system, and a rearview camera. Optional extras included a navigation system, a panoramic sunroof, heated and ventilated front seats, and a driver assistance package with features like blind-spot monitoring and lane-keeping assist. Interior trim options included wood, aluminum, and carbon fiber accents. The dashboard layout is typical of Mercedes-Benz, with a focus on elegance and functionality. The infotainment system, while functional, feels somewhat dated compared to more modern systems.
Chassis & Braking
The GLK 350 4MATIC features a fully independent suspension system, with McPherson struts at the front and a multi-link setup at the rear. This suspension design provides a good balance of ride comfort and handling. Stabilizer bars are fitted to both the front and rear 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 (ESC) are standard features, enhancing safety and control. The GLK 350’s chassis is robust and well-engineered, contributing to a solid and secure feel on the road.
Market Reception & Comparison
The GLK 350 4MATIC was generally well-received by automotive critics. Reviewers praised its comfortable ride, refined interior, and strong engine performance. However, some criticized its relatively small cargo area compared to competitors and its somewhat dated infotainment system. Compared to the GLK 250, the 350 offered a significant performance upgrade, but at a higher price point. The GLK 350 also competed with other luxury compact SUVs such as the Audi Q5, BMW X3, and Acura RDX. The Mercedes-Benz offered a more luxurious interior and a more comfortable ride than some of its rivals, but it lacked the sporty handling of the BMW X3.
Legacy
The Mercedes-Benz GLK 350 4MATIC has proven to be a relatively reliable vehicle, with the M276 engine generally considered durable. Common maintenance items include regular oil changes, coolant flushes, and brake service. Some owners have reported issues with the air suspension system (if equipped) and the electronic components of the infotainment system. On the used car market, the GLK 350 4MATIC remains a popular choice for buyers seeking a well-equipped and comfortable luxury SUV. Its combination of performance, refinement, and all-wheel-drive capability continues to appeal to a wide range of buyers. The GLK paved the way for the GLC-Class, which continues Mercedes-Benz’s success in the compact luxury SUV segment.
