The Mercedes-Benz GLC 400d 4MATIC, produced from July 2019 to July 2023, represents a performance-oriented variant within the C253 GLC Coupe facelift range. Positioned as a premium offering, it combined a powerful diesel engine with Mercedes-Benz’s sophisticated all-wheel-drive system and 9G-TRONIC automatic transmission. This model aimed to deliver a blend of luxury, performance, and efficiency within the compact SUV coupe segment, appealing to buyers seeking a more dynamic driving experience than the lower-powered gasoline options.
| Brand | Mercedes-Benz |
| Model | GLC |
| Generation | GLC Coupe (C253, facelift 2019) |
| Type | GLC 400d (330 Hp) 4MATIC 9G-TRONIC |
| Start of production | July, 2019 |
| End of production | July, 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe, 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) | 183 g/km |
| Fuel consumption (economy) – urban (NEDC) | 8-8.5 l/100 km (29.4 – 27.7 US mpg, 35.3 – 33.2 UK mpg, 12.5 – 11.8 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 5.3-5.8 l/100 km (44.4 – 40.6 US mpg, 53.3 – 48.7 UK mpg, 18.9 – 17.2 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) | 168-177 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, 177.9 Hp/tonne |
| Weight-to-torque ratio | 2.7 kg/Nm, 377.4 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 | 6 l (6.34 US qt | 5.28 UK qt) |
| Coolant | 12.5 l (13.21 US qt | 11 UK qt) |
| Kerb Weight | 1855 kg (4089.57 lbs.) |
| Max. weight | 2585 kg (5698.95 lbs.) |
| Max load | 730 kg (1609.37 lbs.) |
| Trunk (boot) space – minimum | 500 l (17.66 cu. ft.) |
| Trunk (boot) space – maximum | 1400 l (49.44 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 | 4731 mm (186.26 in.) |
| Width | 1890 mm (74.41 in.) |
| Width including mirrors | 2096 mm (82.52 in.) |
| Height | 1600 mm (62.99 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 | 1028 mm (40.47 in.) |
| Ride height (ground clearance) | 129 mm (5.08 in.) |
| Drag coefficient (Cd) | 0.31 |
| Minimum turning circle (turning diameter) | 11.8 m (38.71 ft.) |
| Approach angle | 20.2° |
| Departure angle | 14.8° |
| Ramp-over (brakeover) angle | 11.2° |
| 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 | Independent multi-link 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 | 235/60 R 18 |
| Wheel rims size | 8 J x 18 |
Powertrain & Engine Architecture
The GLC 400d is powered by the OM 656.929, a 2.9-liter inline-six cylinder diesel engine. This engine is a significant departure from the previous generation of Mercedes-Benz diesel engines, featuring a modular design with a cylinder head positioned directly over the combustion chambers. This configuration, combined with a two-stage turbocharging system and a common-rail direct injection system operating at pressures up to 2,700 bar, contributes to its high output and efficiency. The engine produces 330 horsepower at 3,600 rpm and a substantial 700 Nm (516 lb-ft) of torque available from a low 1,200 rpm, sustaining through 3,200 rpm. The 9G-TRONIC nine-speed automatic transmission is standard, offering smooth and efficient gear changes. This transmission is known for its wide gear ratio spread, contributing to both fuel economy and responsive acceleration.
Driving Characteristics
The combination of the high-torque diesel engine and the 9G-TRONIC transmission results in strong acceleration. The 0-60 mph sprint is achieved in approximately 4.8 seconds, making the GLC 400d one of the quicker options in its class. The transmission’s programming prioritizes smooth shifts during normal driving, but can quickly downshift when more power is needed. Compared to the base gasoline models, the 400d offers significantly more responsive acceleration, particularly in overtaking situations. While the manual transmission isn’t available on this trim, the 9G-TRONIC provides a good balance between convenience and performance. The 4MATIC all-wheel-drive system ensures confident handling in various weather conditions, distributing torque between the front and rear axles as needed.
Equipment & Trim Levels
The GLC 400d 4MATIC typically came well-equipped as a higher-end trim. Standard features included leather upholstery, heated front seats, a premium sound system, and a comprehensive suite of driver-assistance systems such as adaptive cruise control, lane-keeping assist, and automatic emergency braking. The MBUX infotainment system with its touchscreen display and voice control was also standard. Optional extras included a panoramic sunroof, upgraded interior trim materials, and a head-up display. The overall interior ambiance focused on luxury and technology, with high-quality materials and a modern design.
Chassis & Braking
The GLC 400d utilizes a coil spring suspension setup at the front and an independent multi-link suspension at the rear. The suspension is tuned to provide a comfortable ride while maintaining good handling characteristics. Ventilated disc brakes are fitted on all four wheels, providing ample stopping power. The electronic stability program (ESP) and anti-lock braking system (ABS) are standard safety features. The steering is electrically assisted, offering precise and responsive control.
Market Reception & Comparison
The GLC 400d 4MATIC was generally well-received by automotive critics. It was praised for its powerful engine, smooth transmission, and luxurious interior. Fuel economy was considered respectable for a vehicle of its size and performance, averaging around 33.6 US mpg (combined WLTP). Compared to the GLC 300 (gasoline), the 400d offered a significant performance upgrade, but at a higher price point. The 400d also provided a more refined driving experience than the lower-powered diesel variants. Reliability reports have been generally positive, with the OM 656 engine proving to be robust and durable.
Legacy
The Mercedes-Benz GLC 400d 4MATIC (C253) represents a compelling blend of performance, luxury, and efficiency. The OM 656 engine has established itself as a reliable and capable powerplant. On the used car market, these models hold their value relatively well, particularly those with low mileage and a full service history. The combination of its powerful engine, comfortable ride, and advanced technology makes it a desirable option for buyers seeking a premium compact SUV coupe.
