The Mercedes-Benz GLC 400d 4MATIC, produced from 2019 to July 2022, represents a significant offering within the X253 GLC SUV generation, particularly after its 2019 facelift. Positioned as a premium, high-performance variant, it catered to buyers seeking a blend of luxury, capability, and strong diesel-powered performance. This model distinguished itself with its potent inline-six diesel engine and sophisticated 9G-TRONIC automatic transmission, offering a compelling alternative to gasoline-powered GLC models and competitors in the luxury compact SUV segment.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLC |
| Generation | GLC SUV (X253, facelift 2019) |
| Type | GLC 400d (330 Hp) 4MATIC 9G-TRONIC |
| Start of production | 2019 |
| End of production | July, 2022 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 7 l/100 km (33.6 US mpg, 40.4 UK mpg, 14.3 km/l) |
| CO2 emissions (WLTP) | 184 g/km |
| Fuel consumption (economy) – urban (NEDC) | 8.1-8.5 l/100 km (29 – 27.7 US mpg, 34.9 – 33.2 UK mpg, 12.3 – 11.8 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 5.3-5.7 l/100 km (44.4 – 41.3 US mpg, 53.3 – 49.6 UK mpg, 18.9 – 17.5 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 6.4-6.7 l/100 km (36.8 – 35.1 US mpg, 44.1 – 42.2 UK mpg, 15.6 – 14.9 km/l) |
| CO2 emissions (NEDC) | 168-176 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 5.1 sec |
| Acceleration 0 – 62 mph | 5.1 sec |
| Acceleration 0 – 60 mph | 4.8 sec |
| Maximum speed | 240 km/h (149.13 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Weight-to-power ratio | 5.6 kg/Hp, 179.8 Hp/tonne |
| Weight-to-torque ratio | 2.6 kg/Nm, 381.5 Nm/tonne |
| Power | 330 Hp @ 3600 rpm |
| Torque | 700 Nm @ 1200-3200 rpm (516.29 lb.-ft. @ 1200-3200 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 656.929 |
| Engine displacement | 2925 cm3 (178.49 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 92.4 mm (3.64 in.) |
| Compression ratio | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 12.5 l (13.21 US qt | 11 UK qt) |
| Kerb Weight | 1835 kg (4045.48 lbs.) |
| Max. weight | 2575 kg (5676.9 lbs.) |
| Max load | 740 kg (1631.42 lbs.) |
| Trunk (boot) space – minimum | 550 l (19.42 cu. ft.) |
| Trunk (boot) space – maximum | 1600 l (56.5 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 with brakes (12%) | 2500 kg (5511.56 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4658 mm (183.39 in.) |
| Width | 1890 mm (74.41 in.) |
| Width including mirrors | 2096 mm (82.52 in.) |
| Height | 1644 mm (64.72 in.) |
| Wheelbase | 2873 mm (113.11 in.) |
| Front track | 1621 mm (63.82 in.) |
| Rear (Back) track | 1617 mm (63.66 in.) |
| Front overhang | 830 mm (32.68 in.) |
| Rear overhang | 955 mm (37.6 in.) |
| Ride height (ground clearance) | 123 mm (4.84 in.) |
| Drag coefficient (Cd) | 0.32 |
| Minimum turning circle (turning diameter) | 11.8 m (38.71 ft.) |
| Approach angle | 19.9° |
| Departure angle | 14.1° |
| Ramp-over (brakeover) angle | 12.1° |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives permanently the four wheels of the vehicle. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
| Front suspension | Coil spring |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/45 R 18 |
INTRODUCTION
The Mercedes-Benz GLC 400d 4MATIC, launched in 2019 as part of the X253 facelift, represented a significant upgrade in the compact luxury SUV segment. Built on the robust MRA (Modular Rear-wheel Architecture) platform shared with other Mercedes-Benz models like the C-Class and E-Class, the GLC aimed to deliver a refined driving experience coupled with practical versatility. The 400d variant, specifically, was designed to appeal to customers prioritizing performance and fuel efficiency, offering a diesel engine alternative to the gasoline options available in the GLC lineup. It occupied a mid-to-high position within the GLC range, sitting above the 200d and 300d models but below the performance-oriented AMG variants.
Powertrain & Engine Architecture
At the heart of the GLC 400d lies the OM 656.929, a 2.9-liter inline-six diesel engine. This engine marked a departure from the previous V6 diesel configurations used by Mercedes-Benz, offering improved refinement and efficiency. The OM 656 features a steel piston block, a variable-geometry turbocharger, and a sophisticated common-rail direct injection system operating at pressures up to 2,700 bar. The engine also incorporates a close-coupled Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) system to meet stringent Euro 6d-ISC-FCM emission standards. Paired with the engine is the 9G-TRONIC nine-speed automatic transmission. This transmission is known for its smooth shifts and wide gear ratio spread, contributing to both fuel economy and performance. The 9G-TRONIC features a torque converter lockup clutch that engages across multiple gears, minimizing slippage and improving efficiency.
Driving Characteristics
The GLC 400d 4MATIC delivers a compelling driving experience characterized by strong acceleration and confident handling. The 700 Nm (516 lb-ft) of torque available from just 1200 rpm provides effortless pulling power, making it ideal for overtaking and navigating varied terrain. The 9G-TRONIC transmission is well-tuned to the engine’s characteristics, providing seamless gear changes and keeping the engine within its optimal power band. Compared to the lower-powered GLC 200d and 300d models, the 400d offers a noticeably more responsive and engaging driving experience. While not as overtly sporty as the AMG variants, the 400d strikes a good balance between performance and comfort. The 4MATIC all-wheel-drive system provides excellent traction in all weather conditions, enhancing stability and control.
Equipment & Trim Levels
The GLC 400d 4MATIC typically came well-equipped as standard, reflecting its position as a premium model. Standard features generally included leather upholstery, heated front seats, a premium sound system, a large infotainment display with navigation, and a suite of driver-assistance systems such as adaptive cruise control, lane-keeping assist, and automatic emergency braking. Optional extras included features like a panoramic sunroof, upgraded leather packages, a head-up display, and advanced parking assist systems. Interior trim options varied, allowing customers to personalize the cabin with different wood or aluminum accents. The dashboard layout was typical of Mercedes-Benz, featuring a blend of traditional luxury and modern technology.
Chassis & Braking
The GLC 400d 4MATIC utilizes a four-wheel independent suspension system with coil springs and adaptive dampers. This suspension setup provides a comfortable ride while maintaining good body control. The 4MATIC all-wheel-drive system employs a multi-plate clutch to distribute torque between the front and rear axles, optimizing traction and stability. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The GLC 400d also incorporates ABS (Anti-lock Braking System), Electronic Stability Program (ESP), and other advanced braking technologies to enhance safety.
Market Reception & Comparison
The GLC 400d 4MATIC was generally well-received by automotive critics, who praised its powerful engine, refined ride, and luxurious interior. It was often compared favorably to competitors such as the Audi Q5, BMW X3, and Porsche Macan. While the gasoline-powered GLC models offered a more traditional driving experience, the 400d appealed to buyers seeking the fuel efficiency and torque characteristics of a diesel engine. Fuel economy figures were competitive for the segment, and the 400d generally demonstrated good reliability. However, some critics noted that the diesel engine could be slightly noisier than the gasoline alternatives.
Legacy
The OM 656 engine family, as featured in the GLC 400d, has proven to be a robust and reliable powertrain. The 9G-TRONIC transmission has also established a reputation for durability. On the used car market, the GLC 400d 4MATIC holds its value well, reflecting its desirable combination of performance, luxury, and efficiency. These models continue to be sought after by buyers looking for a well-rounded and capable luxury SUV. The GLC 400d represents a significant step forward in diesel engine technology, offering a compelling alternative to gasoline-powered vehicles while meeting increasingly stringent emission standards.
