The Mercedes-Benz E 450d 4MATIC, introduced with the W214 generation E-Class in 2023, represents a sophisticated blend of diesel efficiency, performance, and mild-hybrid technology. Positioned as a mid-to-upper tier offering within the E-Class lineup, it caters to buyers seeking a luxurious sedan with strong torque and respectable fuel economy. This variant combines a powerful inline-six diesel engine with a 48-volt mild-hybrid system and a nine-speed automatic transmission, delivering all-wheel drive capability through Mercedes-Benz’s 4MATIC system. The E 450d aims to bridge the gap between the more economical base models and the high-performance AMG variants.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | E-class |
| Generation | E-class (W214) |
| Type | E 450d (367 Hp) Mild Hybrid 4MATIC 9G-TRONIC |
| Start of production | 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 5.9-6.6 l/100 km (39.9 – 35.6 US mpg, 47.9 – 42.8 UK mpg, 16.9 – 15.2 km/l) |
| CO2 emissions (WLTP) | 155-174 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 4.8 sec |
| Acceleration 0 – 62 mph | 4.8 sec |
| Acceleration 0 – 60 mph | 4.6 sec |
| Maximum speed | 250 km/h (155.34 mph) – Electronically limited |
| Emission standard | Euro 6d-ISC-FCM |
| Weight-to-power ratio | 5.4 kg/Hp, 184.4 Hp/tonne |
| Weight-to-torque ratio | 2.7 kg/Nm, 376.9 Nm/tonne |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 23 Hp |
| Electric motor Torque | 205 Nm (151.2 lb.-ft.) |
| Electric motor location | Between the combustion engine and the transmission |
| Power | 367 Hp @ 4000 rpm |
| Torque | 750 Nm @ 1350-2800 rpm (553.17 lb.-ft. @ 1350-2800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 656 |
| Engine displacement | 2989 cm3 (182.4 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Compression ratio | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | BiTurbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Kerb Weight | 1990 kg (4387.2 lbs.) |
| Max. weight | 2675 kg (5897.37 lbs.) |
| Max load | 685 kg (1510.17 lbs.) |
| Trunk (boot) space – minimum | 540 l (19.07 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| AdBlue tank | 24 l (6.34 US gal | 5.28 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 84 kg (185.19 lbs.) |
| Length | 4949 mm (194.84 in.) |
| Width | 1880 mm (74.02 in.) |
| Width including mirrors | 2065 mm (81.3 in.) |
| Height | 1469 mm (57.83 in.) |
| Wheelbase | 2961 mm (116.57 in.) |
| Front track | 1629 mm (64.13 in.) |
| Rear track | 1643 mm (64.69 in.) |
| Front overhang | 848 mm (33.39 in.) |
| Rear overhang | 1140 mm (44.88 in.) |
| Drag coefficient (Cd) | 0.23 |
| Minimum turning circle | 12 m (39.37 ft.) |
| Drivetrain Architecture | ICE and electric motor drive all four wheels in mixed mode. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 9 |
| Gearbox type | Automatic transmission G-TRONIC |
Powertrain & Engine Architecture
The heart of the E 450d is the OM 656 3.0-liter inline-six diesel engine. This engine is a significant departure from the older V6 diesels used in previous E-Class generations, offering improved refinement and efficiency. It features a sophisticated two-stage turbocharging system with variable turbine geometry (VTG) to deliver strong torque across a wide RPM range. The common-rail direct injection system operates at extremely high pressures, optimizing fuel combustion. The 48-volt mild-hybrid system integrates a belt-driven starter-generator (RSG) that provides several benefits, including smoother start/stop operation, energy recuperation during braking, and a small power boost during acceleration. The RSG also allows for ‘gliding’ mode, where the engine can shut off during coasting to further improve fuel economy. The 9G-TRONIC nine-speed automatic transmission is standard, offering quick and smooth gear changes. It’s calibrated to work seamlessly with the engine’s torque characteristics, providing ample power for both relaxed cruising and spirited driving.
Driving Characteristics
The E 450d 4MATIC delivers a refined and effortless driving experience. The abundant 750 Nm (553 lb-ft) of torque available from just 1350 rpm provides strong acceleration in virtually any gear. The 0-60 mph time of around 4.6 seconds is impressive for a large, luxury sedan. The 9G-TRONIC transmission is generally unobtrusive, selecting the appropriate gear for the driving conditions. Compared to the E 300d, the E 450d offers a noticeable performance advantage, while remaining more fuel-efficient and less stressed than the higher-output AMG models. The mild-hybrid system contributes to a smoother and quieter driving experience, particularly in urban environments. The 4MATIC all-wheel-drive system provides excellent traction and stability in all weather conditions.
Equipment & Trim Levels
The E 450d typically comes well-equipped as standard. Interior features generally include premium leather upholstery, heated and ventilated front seats, a large dual-screen display incorporating the infotainment system and digital instrument cluster, and a comprehensive suite of driver-assistance systems. Optional extras include advanced suspension systems (like AIRMATIC air suspension), premium sound systems, and various interior trim options. The E 450d often sits in the middle to upper range of E-Class trims, offering a balance of luxury, performance, and technology.
Chassis & Braking
The W214 E-Class utilizes a multi-link suspension setup at both the front and rear axles, providing a comfortable and controlled ride. The E 450d, due to its higher weight and performance, often features slightly stiffer springs and dampers compared to the base models. Air suspension is available as an option, further enhancing ride comfort and allowing for adjustable ride height. Braking duties are handled by ventilated discs on all four wheels, providing ample stopping power. Standard safety features include ABS, electronic stability control, and a suite of driver-assistance systems such as automatic emergency braking and lane-keeping assist.
Market Reception & Comparison
The E 450d has been generally well-received by automotive critics. It’s praised for its refined engine, strong performance, and comfortable ride. The mild-hybrid system is seen as a positive addition, improving fuel economy and reducing emissions. Compared to the E 300d, the E 450d offers a significant performance upgrade without sacrificing fuel efficiency. Against competitors like the BMW 540d and Audi A6 40 TDI, the E 450d holds its own in terms of performance, luxury, and technology. Some critics note that the diesel engine, while refined, may not appeal to all buyers due to ongoing concerns about diesel emissions.
Legacy
The OM 656 engine family, used in the E 450d, has proven to be a robust and reliable powerplant. While long-term reliability data for the W214 generation is still emerging, the OM 656 has a good track record in other Mercedes-Benz models. The integration of the 48-volt mild-hybrid system represents a step towards greater electrification and improved fuel efficiency. On the used car market, the E 450d is expected to hold its value well due to its desirable combination of performance, luxury, and fuel economy. However, potential buyers should be aware of the potential for higher maintenance costs associated with the advanced technology and diesel particulate filter systems.
