The Mercedes-Benz GLC 300d 4MATIC, introduced in September 2022 as part of the X254 generation, represents a significant evolution in the luxury compact SUV segment. This variant combines a 2.0-liter turbocharged diesel engine with mild hybrid technology and a 9-speed automatic transmission, delivering a balance of performance, efficiency, and refinement. Positioned as a mid-range offering within the GLC lineup, the 300d caters to buyers seeking a more powerful and fuel-efficient alternative to the base GLC 260, while offering a more accessible price point than the higher-performance AMG models. It’s a key model for Mercedes-Benz in the North American and European markets, where demand for diesel-powered SUVs remains strong.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLC |
| Generation | GLC SUV (X254) |
| Type | GLC 300d (269 Hp) Mild Hybrid 4MATIC 9G-TRONIC |
| Start of production | September, 2022 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 5.6-6.2 l/100 km (42 – 37.9 US mpg) |
| CO2 emissions (WLTP) | 146-163 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.3 sec |
| Acceleration 0 – 62 mph | 6.3 sec |
| Acceleration 0 – 60 mph | 6 sec |
| Maximum speed | 243 km/h (150.99 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Weight-to-power ratio | 7.2 kg/Hp |
| Weight-to-torque ratio | 3.5 kg/Nm |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 23 Hp |
| Electric motor Torque | 200 Nm (147.51 lb.-ft.) |
| Engine Power | 269 Hp @ 4200 rpm |
| Engine Torque | 550 Nm @ 1800-2200 rpm (405.66 lb.-ft. @ 1800-2200 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 654.820 |
| Engine displacement | 1993 cm3 (121.62 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.3 mm (3.71 in.) |
| Compression ratio | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Twin-Turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6 l (6.34 US qt | 5.28 UK qt) |
| Kerb Weight | 1950 kg (4299.01 lbs.) |
| Max. weight | 2570 kg (5665.88 lbs.) |
| Max load | 620 kg (1366.87 lbs.) |
| Trunk (boot) space – minimum | 620 l (21.9 cu. ft.) |
| Trunk (boot) space – maximum | 1680 l (59.33 cu. ft.) |
| Fuel tank capacity | 62 l (16.38 US gal | 13.64 UK gal) |
| AdBlue tank | 24 l (6.34 US gal | 5.28 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 2500 kg (5511.56 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 100 kg (220.46 lbs.) |
| Length | 4716 mm (185.67 in.) |
| Width | 1890 mm (74.41 in.) |
| Width including mirrors | 2075 mm (81.69 in.) |
| Height | 1640 mm (64.57 in.) |
| Wheelbase | 2888 mm (113.7 in.) |
| Front track | 1627 mm (64.06 in.) |
| Rear (Back) track | 1640 mm (64.57 in.) |
| Front overhang | 843 mm (33.19 in.) |
| Rear overhang | 985 mm (38.78 in.) |
| Ride height (ground clearance) | 174-194 mm (6.85 – 7.64 in.) |
| Minimum turning circle (turning diameter) | 10.9 m (35.76 ft.) |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
Powertrain & Engine Architecture
The heart of the GLC 300d is the OM 654.820, a 2.0-liter inline-four cylinder diesel engine. This engine utilizes a twin-turbocharger setup with variable geometry turbines (VGT) and an intercooler, enabling it to deliver substantial torque across a broad rev range. The engine employs a sophisticated diesel commonrail fuel injection system, operating at extremely high pressures to optimize combustion efficiency and reduce emissions. The valvetrain features a double overhead camshaft (DOHC) design with four valves per cylinder. The mild hybrid system, a 48-volt architecture, integrates a 23 horsepower electric motor between the engine and the 9G-TRONIC automatic transmission. This system provides a power boost during acceleration, enables smoother start/stop operation, and allows for regenerative braking to recoup energy. The 9G-TRONIC transmission itself is a nine-speed automatic known for its smooth shifts and wide gear ratio spread, contributing to both fuel efficiency and performance.
Driving Characteristics
The GLC 300d 4MATIC offers a refined and capable driving experience. The combination of the turbocharged diesel engine and the mild hybrid system results in strong low-end torque, making it responsive in everyday driving situations. Acceleration to 60 mph takes approximately 6 seconds, which is competitive within its class. The 9G-TRONIC transmission provides seamless gear changes, and the 4MATIC all-wheel-drive system ensures confident traction in various weather conditions. Compared to the base GLC 260, the 300d offers noticeably more power and torque, resulting in quicker acceleration and more effortless highway cruising. While not as sporty as the AMG variants, the 300d provides a comfortable and engaging driving experience, prioritizing refinement and efficiency.
Equipment & Trim Levels
The GLC 300d 4MATIC typically comes well-equipped as standard. Common features include Mercedes-Benz User Experience (MBUX) infotainment system with a touchscreen display, Apple CarPlay and Android Auto integration, a panoramic sunroof, leather upholstery, heated front seats, and a suite of advanced driver-assistance systems such as adaptive cruise control, lane-keeping assist, and automatic emergency braking. Optional extras often include premium audio systems, ventilated front seats, a head-up display, and various cosmetic enhancements. Interior trim options range from aluminum to wood finishes, allowing buyers to personalize the cabin to their preferences.
Chassis & Braking
The GLC 300d utilizes a sophisticated chassis design featuring an independent multi-link suspension at both the front and rear. Air suspension is available as an option, providing adjustable ride height and enhanced comfort. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Standard safety features include ABS (Anti-lock Braking System), Electronic Stability Program (ESP), and a range of airbags. Available options like 4-wheel steering (4WS) further enhance handling and maneuverability.
Market Reception & Comparison
The GLC 300d has been generally well-received by automotive critics, praised for its blend of performance, efficiency, and luxury. Reviewers have highlighted the engine’s strong torque output and the transmission’s smooth operation. Fuel economy is a strong point, with the GLC 300d achieving around 37.9 to 42 US mpg in combined driving. Compared to the GLC 260, the 300d offers a significant performance upgrade, while remaining relatively fuel-efficient. Compared to gasoline-powered competitors, the 300d often delivers superior fuel economy and torque, although it may come with slightly higher maintenance costs associated with the diesel engine and emissions control systems.
Legacy
The OM 654 engine family, including the version used in the GLC 300d, has proven to be a reliable and durable powertrain. While diesel engines generally require more diligent maintenance than their gasoline counterparts, the OM 654 has a good track record for longevity. On the used car market, the GLC 300d 4MATIC holds its value well, appealing to buyers seeking a premium SUV with strong fuel economy and a comfortable driving experience. Its combination of modern technology, refined performance, and practical features ensures its continued relevance in the luxury SUV segment for years to come.
