The Mercedes-Benz GLC 300de 4MATIC, introduced in June 2022 as part of the X254 generation GLC SUV, represents a significant step in the brand’s plug-in hybrid (PHEV) strategy. Positioned as a premium offering within the GLC lineup, it combines a diesel engine with an electric motor to deliver both efficiency and performance. This variant aimed to appeal to buyers seeking reduced emissions and the flexibility of electric driving for shorter commutes, while retaining the long-range capability of a conventional powertrain. The 300de is a key component of Mercedes-Benz’s efforts to meet increasingly stringent emissions regulations in Europe and other markets.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLC |
| Generation | GLC SUV (X254) |
| Type | GLC 300de (335 Hp) Plug-in Hybrid 4MATIC 9G-TRONIC |
| Start of production | June, 2022 |
| Powertrain Architecture | PHEV (Plug-in Hybrid Electric Vehicle) |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 0.5-0.7 l/100 km (470.4 – 336 US mpg, 565 – 403.5 UK mpg, 200 – 142.9 km/l) |
| CO2 emissions (WLTP) | 13-17 g/km |
| Fuel Type | Diesel / electricity |
| Acceleration 0 – 100 km/h | 6.4 sec |
| Acceleration 0 – 62 mph | 6.4 sec |
| Acceleration 0 – 60 mph | 6.1 sec |
| Maximum speed | 217 km/h (134.84 mph) |
| Weight-to-power ratio | 7 kg/Hp, 143.2 Hp/tonne |
| Weight-to-torque ratio | 3.1 kg/Nm, 320.5 Nm/tonne |
| Gross battery capacity | 31.2 kWh |
| Battery technology | Lithium-ion (Li-Ion) |
| Battery location | Under the trunk |
| Recuperation output | 100 kW |
| All-electric range (WLTP) | 102-117 km (63.38 – 72.7 mi) |
| Average Energy consumption (WLTP) | 24.4-27.4 kWh/100 km (39.27 – 44.1 kWh/100 mi, 86 – 76 MPGe, 4.1 – 3.6 km/kWh, 2.5 – 2.3 mi/kWh) |
| Max speed (electric) | 140 km/h (86.99 mph) |
| Electric motor power | 136 Hp |
| Electric motor Torque | 440 Nm (324.53 lb.-ft.) |
| Electric motor location | Between the combustion engine and the transmission |
| System power | 335 Hp |
| System torque | 750 Nm (553.17 lb.-ft.) |
| Power | 197 Hp @ 3600 rpm |
| Torque | 440 Nm @ 1800-2800 rpm (324.53 lb.-ft. @ 1800-2800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 654 M |
| 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 |
| Kerb Weight | 2340 kg (5158.82 lbs.) |
| Max. weight | 2885 kg (6360.34 lbs.) |
| Max load | 545 kg (1201.52 lbs.) |
| Fuel tank capacity | 62 l (16.38 US gal | 13.64 UK gal) |
| Permitted trailer load with brakes (12%) | 2000 kg (4409.25 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 | 1648 mm (64.88 in.) |
| Wheelbase | 2888 mm (113.7 in.) |
| Front track | 1627 mm (64.06 in.) |
| Rear (Back) track | 1640 mm (64.57 in.) |
| Drag coefficient (Cd) | 0.29 |
| Minimum turning circle (turning diameter) | 11 m (36.09 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) and the electric motor permanently drive the four wheels of the car with the ability to work in full electric or mixed mode. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension, Air suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system), 4-wheel steering (4WS, active rear steering) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | Front wheel tires: 235/55 R19, Rear wheel tires: 255/50 R19 |
| Wheel rims size | Front wheel rims: 8J x 19, Rear wheel rims: 9J x 19 |
INTRODUCTION
The Mercedes-Benz GLC 300de 4MATIC, launched in 2022, is a plug-in hybrid SUV built on the X254 platform, which also underpins the latest generation GLC. It represents a significant advancement in Mercedes-Benz’s strategy to offer a wider range of electrified vehicles. The “de” designation signifies a diesel-electric hybrid, differentiating it from petrol-electric PHEV variants. This model was primarily targeted at the European market, where diesel engines remain popular and where government incentives favor low-emission vehicles. The 300de aims to provide a balance between fuel efficiency, performance, and practicality, appealing to customers who desire a premium SUV with reduced environmental impact.
Powertrain & Engine Architecture
At the heart of the GLC 300de lies a 1993cc inline-four cylinder diesel engine, identified by the OM 654 M engine code. This engine utilizes a twin-turbocharger system with an intercooler, producing 197 horsepower at 3600 rpm and 440 Nm (324.53 lb-ft) of torque between 1800-2800 rpm. The engine employs a diesel commonrail direct injection system for precise fuel delivery and optimized combustion. Paired with the diesel engine is a 136 hp electric motor integrated between the engine and the 9G-TRONIC nine-speed automatic transmission. The electric motor contributes an additional 440 Nm (324.53 lb-ft) of torque. The combined system output is 335 hp and 750 Nm (553.17 lb-ft) of torque. The 31.2 kWh lithium-ion battery pack, located under the trunk floor, provides an all-electric range of 102-117 km (63.38 – 72.7 mi) according to WLTP standards. The battery supports AC charging for convenient home or public charging.
Driving Characteristics
The GLC 300de offers a refined and versatile driving experience. In electric mode, the vehicle provides near-silent operation and instant torque, making it ideal for urban driving. The 9G-TRONIC transmission is well-tuned to work seamlessly with both the diesel engine and the electric motor, providing smooth and responsive gear changes. The combined power output of 335 hp delivers brisk acceleration, with a 0-100 km/h (0-62 mph) time of 6.4 seconds. Compared to the petrol-powered GLC 300, the 300de offers similar performance but with significantly improved fuel economy. The diesel-electric powertrain provides a broader torque curve than the petrol engine, resulting in strong pulling power at lower speeds. The 4MATIC all-wheel-drive system ensures confident handling and traction in various weather conditions. The weight of the battery does impact handling slightly, making it feel a bit less agile than lighter GLC variants.
Equipment & Trim Levels
The GLC 300de 4MATIC typically comes well-equipped as standard. Interior features include premium upholstery, a high-resolution infotainment system with MBUX (Mercedes-Benz User Experience), and a comprehensive suite of driver-assistance systems. Standard features often include automatic climate control, heated front seats, and a power liftgate. Optional extras include a panoramic sunroof, upgraded audio system, and advanced driver-assistance packages with features like adaptive cruise control and lane-keeping assist. The interior design is consistent with other GLC models, emphasizing luxury and comfort. Trim levels generally offer varying degrees of customization, with options for different interior finishes and exterior styling elements.
Chassis & Braking
The GLC 300de utilizes an independent multi-link suspension setup for both the front and rear axles. The rear suspension often incorporates air suspension, providing adjustable ride height and improved comfort. This air suspension system can also adapt to driving conditions, optimizing handling and stability. 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 control, and a suite of airbags. The 4MATIC all-wheel-drive system distributes torque between the front and rear axles as needed, enhancing traction and stability. The steering system is a rack-and-pinion type with electric power assistance.
Market Reception & Comparison
The GLC 300de was generally well-received by automotive critics, who praised its fuel efficiency, refined driving experience, and luxurious interior. Compared to other GLC variants, the 300de offered a compelling alternative for buyers prioritizing low emissions and electric driving capability. The diesel-electric powertrain provided significantly better fuel economy than the petrol-powered models, while offering comparable performance. However, the 300de’s higher price tag and the added weight of the battery pack were noted as potential drawbacks. Compared to the GLC 300e (petrol-electric hybrid), the 300de offered a longer all-electric range but potentially less overall refinement due to the diesel engine’s inherent characteristics.
Legacy
The Mercedes-Benz GLC 300de 4MATIC represents a key step in Mercedes-Benz’s transition towards electrification. The OM 654 diesel engine, combined with the electric motor and 9G-TRONIC transmission, has proven to be a reliable and efficient powertrain. While long-term reliability data is still emerging, early reports suggest that the hybrid system is generally robust. On the used car market, the 300de is likely to hold its value well due to its fuel efficiency and low emissions. As environmental regulations continue to tighten, plug-in hybrid models like the GLC 300de will likely become increasingly desirable, solidifying its place as a significant vehicle in Mercedes-Benz’s history.
