The Mercedes-Benz E 400d 4MATIC Coupe (C238) represents a compelling blend of performance and efficiency within the fifth generation of the E-Class Coupe, produced from September 2018 to 2020. Positioned as a premium offering, it slotted above the E 300 models and below the performance-oriented AMG variants. This variant distinguished itself with a powerful diesel engine and advanced 9G-TRONIC automatic transmission, coupled with Mercedes-Benz’s 4MATIC all-wheel-drive system. It was primarily marketed towards buyers seeking a luxurious grand tourer with strong acceleration and refined driving dynamics.
| Brand | Mercedes-Benz |
| Model | E-Class |
| Generation | E-Class Coupe (C238) |
| Type | E 400d (340 Hp) 4MATIC 9G-TRONIC |
| Start of Production | September 2018 |
| End of Production | 2020 |
| Powertrain Architecture | Internal Combustion Engine |
| Body Type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel Consumption (Low Speed – WLTP) | 6.7 l/100 km (35.1 US mpg, 42.2 UK mpg, 14.9 km/l) |
| Fuel Consumption (High Speed – WLTP) | 7.4 l/100 km (31.8 US mpg, 38.2 UK mpg, 13.5 km/l) |
| CO2 Emissions (WLTP) | 176-195 g/km |
| Fuel Consumption (Urban) | 5.9 l/100 km (39.9 US mpg, 47.9 UK mpg, 16.9 km/l) |
| Fuel Consumption (Extra Urban) | 4.5 l/100 km (52.3 US mpg, 62.8 UK mpg, 22.2 km/l) |
| Fuel Consumption (Combined) | 5.0 l/100 km (47 US mpg, 56.5 UK mpg, 20 km/l) |
| CO2 Emissions | 158 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 | 250 km/h (155.34 mph) |
| Emission Standard | Euro 6 |
| Weight-to-Power Ratio | 5.5 kg/Hp, 182.3 Hp/tonne |
| Weight-to-Torque Ratio | 2.7 kg/Nm, 375.3 Nm/tonne |
| Power | 340 Hp @ 3600-4400 rpm |
| Power per Liter | 116.2 Hp/l |
| 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 |
| Compression Ratio | 15.5:1 |
| Valves per Cylinder | 4 |
| Fuel Injection System | Diesel Commonrail |
| Engine Aspiration | Turbocharger, Intercooler |
| Engine Oil Capacity | 8.5 l (8.98 US qt, 7.48 UK qt) |
| Coolant Capacity | 13 l (13.74 US qt, 11.44 UK qt) |
| Kerb Weight | 1865 kg (4111.62 lbs) |
| Max Weight | 2440 kg (5379.28 lbs) |
| Max Load | 575 kg (1267.66 lbs) |
| Trunk Space (Minimum) | 425 l (15.01 cu. ft.) |
| Fuel Tank Capacity | 66 l (17.44 US gal, 14.52 UK gal) |
| Trailer Load (Braked – 12%) | 1800 kg (3968.32 lbs) |
| Trailer Load (Unbraked) | 750 kg (1653.47 lbs) |
| Length | 4846 mm (190.79 in) |
| Width | 1860 mm (73.23 in) |
| Width (Including Mirrors) | 2065 mm (81.3 in) |
| Height | 1431 mm (56.34 in) |
| Wheelbase | 2873 mm (113.11 in) |
| Front Track | 1599 mm (62.95 in) |
| Rear Track | 1591 mm (62.64 in) |
| Front Overhang | 853 mm (33.58 in) |
| Rear Overhang | 1120 mm (44.09 in) |
| Turning Circle | 11.61 m (38.09 ft) |
| Drive Wheel | All Wheel Drive (4×4) |
| Gears/Gearbox Type | 9 Gears, Automatic Transmission (9G-TRONIC) |
| Front Suspension | Independent Multi-Link |
| Rear Suspension | Independent Multi-Link |
| Front Brakes | Ventilated Discs |
| Rear Brakes | Ventilated Discs |
| Steering Type | Steering Rack and Pinion |
| Power Steering | Electric |
| Tire Size | 245/40 R19; 275/35 R19 |
| Wheel Rim Size | 19″ |
Powertrain & Engine Architecture
The heart of the E 400d 4MATIC is the OM 656.929, a 2.9-liter inline-six cylinder diesel engine. This engine represented a significant advancement in Mercedes-Benz’s diesel technology, featuring a sophisticated diesel commonrail injection system and a two-stage turbocharger with variable turbine geometry. The high compression ratio of 15.5:1 contributes to its thermal efficiency. The engine also incorporates a particulate filter to meet stringent Euro 6 emission standards. The 9G-TRONIC nine-speed automatic transmission is integral to the powertrain, offering smooth and efficient gear changes. This transmission is known for its wide gear ratio spread, contributing to both fuel economy and responsive acceleration. The 4MATIC all-wheel-drive system provides enhanced traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The E 400d 4MATIC delivers a refined and powerful driving experience. The engine’s substantial 700 Nm (516 lb-ft) of torque, available from a low 1200 rpm, provides effortless acceleration in virtually any situation. The 0-60 mph sprint takes approximately 4.8 seconds, making it a genuinely quick coupe. The 9G-TRONIC transmission is programmed for comfort and efficiency, but can also be shifted manually via steering wheel-mounted paddles. Compared to the E 300 models, the E 400d offers a noticeable increase in performance and a more relaxed cruising experience. While not as overtly sporty as the AMG variants, the E 400d provides ample power for spirited driving. The all-wheel-drive system inspires confidence, particularly on slippery surfaces.
Equipment & Trim Levels
The E 400d 4MATIC typically came well-equipped as standard. Interior features included premium leather upholstery, wood trim, and a high-resolution infotainment system with a central display screen. Standard safety features included automatic emergency braking, lane-keeping assist, and adaptive cruise control. Optional extras included a panoramic sunroof, upgraded sound system, head-up display, and various driver assistance packages. The interior design emphasized luxury and comfort, with a focus on high-quality materials and craftsmanship. The coupe’s interior offered a more intimate and driver-focused experience compared to the E-Class sedan.
Chassis & Braking
The E 400d 4MATIC utilizes an independent multi-link suspension system at both the front and rear axles, providing a comfortable ride and precise handling. The suspension is tuned to balance comfort and control, offering a good compromise between sporty responsiveness and everyday usability. Ventilated disc brakes are fitted on all four wheels, providing ample stopping power. The electronic stability program (ESP) and anti-lock braking system (ABS) work in conjunction to enhance safety and stability. The steering is electrically assisted, offering a precise and responsive feel.
Market Reception & Comparison
The E 400d 4MATIC was generally well-received by automotive critics. It was praised for its powerful and efficient engine, refined driving dynamics, and luxurious interior. Compared to the E 300 models, the E 400d offered a significant performance upgrade, but at a higher price point. Fuel economy was considered excellent for a vehicle of its size and performance, with combined figures around 5.0 l/100 km (47 US mpg). Reliability reports have been generally positive, although diesel engines can be more susceptible to issues with the emissions control systems over time.
Legacy
The OM 656 engine family, as featured in the E 400d, has proven to be a robust and reliable powerplant. The 9G-TRONIC transmission has also established a reputation for durability. On the used car market, the E 400d 4MATIC Coupe holds its value well, appealing to buyers seeking a luxurious and capable grand tourer. Regular maintenance, particularly regarding the diesel particulate filter and emissions systems, is crucial for long-term reliability. The C238 E-Class Coupe, and specifically the E 400d variant, represents a high point in Mercedes-Benz’s coupe design and engineering, offering a compelling blend of performance, luxury, and efficiency.
