The Mercedes-Benz E 300de, introduced in 2023 as part of the W214 E-Class generation, represents a significant step in the brand’s push towards electrified luxury. This plug-in hybrid (PHEV) variant combines a 2.0-liter diesel engine with an electric motor, delivering a combined system output of 313 horsepower and 700 Nm (516 lb-ft) of torque. Positioned as a premium offering within the E-Class lineup, the E 300de caters to buyers seeking both efficiency and performance, offering a substantial all-electric range alongside the convenience of a traditional internal combustion engine. It builds upon the established reputation of the E-Class for comfort, technology, and refinement, while addressing growing environmental concerns.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | E-class |
| Generation | E-class (W214) |
| Type | E 300de (313 Hp) Plug-in Hybrid 4MATIC 9G-TRONIC |
| Start of production | 2023 |
| Powertrain Architecture | PHEV (Plug-in Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 0.5-0.8 l/100 km (470.4 – 294 US mpg, 565 – 353.1 UK mpg, 200 – 125 km/l) |
| CO2 emissions (WLTP) | 14-20 g/km |
| Fuel Type | Diesel / electricity |
| Acceleration 0 – 100 km/h | 6.6 sec |
| Acceleration 0 – 62 mph | 6.6 sec |
| Acceleration 0 – 60 mph | 6.3 sec |
| Maximum speed | 233 km/h (144.78 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Weight-to-power ratio | 7.1 kg/Hp, 140.7 Hp/tonne |
| Weight-to-torque ratio | 3.2 kg/Nm, 314.6 Nm/tonne |
| Gross battery capacity | 25.4 kWh |
| Battery technology | Lithium-ion (Li-Ion) |
| All-electric range (WLTP) | 84-103 km (52.2 – 64 mi) |
| Average Energy consumption (WLTP) | 21.5-24.1 kWh/100 km (34.6 – 38.79 kWh/100 mi, 97 – 87 MPGe, 4.7 – 4.1 km/kWh, 2.9 – 2.6 mi/kWh) |
| Max speed (electric) | 140 km/h (86.99 mph) |
| Electric motor power | 129 Hp |
| Electric motor Torque | 440 Nm (324.53 lb.-ft.) |
| Electric motor location | Between the combustion engine and the transmission |
| Electric motor type | Synchronous |
| System power | 313 Hp |
| System torque | 700 Nm (516.29 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 | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6 l (6.34 US qt | 5.28 UK qt) |
| Kerb Weight | 2225 kg (4905.29 lbs.) |
| Max. weight | 2860 kg (6305.22 lbs.) |
| Max load | 635 kg (1399.94 lbs.) |
| Trunk (boot) space – minimum | 370 l (13.07 cu. ft.) |
| Fuel tank capacity | 50 l (13.21 US gal | 11 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 | 1480 mm (58.27 in.) |
| Wheelbase | 2961 mm (116.57 in.) |
| Front track | 1620 mm (63.78 in.) |
| Rear (Back) track | 1603 mm (63.11 in.) |
| Front overhang | 848 mm (33.39 in.) |
| Rear overhang | 1140 mm (44.88 in.) |
| Ride height (ground clearance) | 121 mm (4.76 in.) |
| Drag coefficient (Cd) | 0.23 |
| Minimum turning circle (turning diameter) | 12 m (39.37 ft.) |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
INTRODUCTION
The W214 E-Class, launched in 2023, represents the fifth generation of Mercedes-Benz’s mid-size executive car. The E 300de variant is a plug-in hybrid diesel, designed to offer a balance between fuel efficiency, reduced emissions, and respectable performance. It slots into the E-Class range as a premium option, positioned above the conventional petrol and diesel models but below the more performance-oriented AMG variants. The ‘de’ designation signifies its diesel-electric powertrain, a configuration particularly popular in European markets where diesel fuel remains prevalent and where regulations incentivize low-emission vehicles. The E 300de is built on the updated MRA 2.0 platform, shared with other Mercedes-Benz models, offering improvements in ride comfort, handling, and technology integration.
Powertrain & Engine Architecture
At the heart of the E 300de lies the OM 654 M, a 2.0-liter inline-four cylinder diesel engine. This engine is a highly advanced design, featuring a cast iron block, aluminum cylinder head, and a sophisticated turbocharging system. It utilizes a commonrail direct fuel injection system, operating at pressures up to 2,700 bar, for precise fuel delivery and optimized combustion. The engine also incorporates variable valve timing (VVT) on both the intake and exhaust sides, controlled by a dual overhead camshaft (DOHC) configuration. Paired with the diesel engine is a 129 horsepower electric motor, integrated between the engine and the 9G-TRONIC nine-speed automatic transmission. This placement allows for seamless transitions between electric, diesel, and combined power modes. The 25.4 kWh lithium-ion battery pack provides a substantial all-electric range of 84-103 km (52.2-64 miles) according to WLTP standards. The 9G-TRONIC transmission is known for its smooth shifting and wide gear ratios, contributing to both fuel efficiency and comfortable cruising.
Driving Characteristics
The E 300de delivers a refined and surprisingly potent driving experience. In electric mode, the vehicle offers near-silent operation and instant torque, making it ideal for urban commuting. Switching to hybrid mode allows the diesel engine to seamlessly assist the electric motor, providing ample power for highway overtaking and spirited driving. The combined system output of 313 hp and 700 Nm (516 lb-ft) results in a 0-60 mph time of around 6.3 seconds. The 9G-TRONIC transmission is well-tuned to the hybrid powertrain, providing smooth and almost imperceptible gear changes. Compared to the standard E 300 petrol variant, the E 300de offers superior torque and a more relaxed driving experience, particularly at lower speeds. While not as sporty as the E 450 or AMG models, the E 300de provides a compelling blend of performance and efficiency.
Equipment & Trim Levels
The E 300de typically comes well-equipped, reflecting its premium positioning within the E-Class range. Standard features generally include Mercedes-Benz’s MBUX infotainment system with a large touchscreen display, digital instrument cluster, leather upholstery, automatic climate control, and a comprehensive suite of safety features such as adaptive cruise control, lane keeping assist, and automatic emergency braking. Optional extras often include air suspension, premium sound systems, panoramic sunroof, and advanced driver assistance packages. Interior trim options range from elegant wood veneers to modern aluminum accents. The overall cabin design emphasizes luxury and technological sophistication, with high-quality materials and meticulous attention to detail.
Chassis & Braking
The E 300de utilizes a sophisticated chassis design, featuring an independent multi-link suspension at both the front and rear. The suspension is tuned to provide a comfortable ride while maintaining good handling characteristics. Air suspension is available as an option, further enhancing ride quality and allowing for adjustable ride height. Braking duties are handled by ventilated discs on all four wheels, providing ample stopping power. The regenerative braking system captures energy during deceleration, helping to recharge the battery and improve overall efficiency. The E 300de’s steering is precise and well-weighted, offering a confident feel on the road.
Market Reception & Comparison
The E 300de has been generally well-received by automotive critics, praised for its fuel efficiency, refined driving experience, and luxurious interior. Compared to the standard E 300 petrol model, the E 300de offers significantly better fuel economy and lower emissions, particularly for drivers who frequently commute in urban areas. Against other plug-in hybrid rivals, such as the BMW 330e and Audi A6 50 TFSI e, the E 300de stands out with its larger battery capacity and longer all-electric range. However, some critics have noted that the diesel engine can be slightly noisy under hard acceleration. Reliability reports are still emerging, but Mercedes-Benz has a generally good reputation for build quality and durability.
Legacy
The E 300de represents a key step in Mercedes-Benz’s transition towards an electrified future. The OM 654 diesel engine, combined with the advanced electric powertrain, demonstrates the potential for combining efficiency and performance. The longevity of this powertrain will depend on factors such as battery degradation and the maintenance of the diesel engine components. In the used car market, the E 300de is likely to appeal to buyers seeking a luxurious and fuel-efficient vehicle with a long-term focus on sustainability. Its combination of comfort, technology, and environmental responsibility positions it as a desirable option in the premium mid-size executive car segment.
