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 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) | 0.5-0.6 l/100 km (470.4 – 392 US mpg, 565 – 470.8 UK mpg, 200 – 166.7 km/l) |
| CO2 emissions (WLTP) | 12-16 g/km |
| Fuel Type | Diesel / electricity |
| Acceleration 0 – 100 km/h | 6.4 sec |
| Acceleration 0 – 62 mph | 6.4 sec |
| Acceleration 0 – 60 mph | 6.1 sec |
| Maximum speed | 235 km/h (146.02 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Weight-to-power ratio | 7 kg/Hp, 143.6 Hp/tonne |
| Weight-to-torque ratio | 3.1 kg/Nm, 321.1 Nm/tonne |
| Gross battery capacity | 25.4 kWh |
| Battery technology | Lithium-ion (Li-Ion) |
| All-electric range (WLTP) | 93-107 km (57.79 – 66.49 mi) |
| Average Energy consumption (WLTP) | 19.8-22.4 kWh/100 km (31.87 – 36.05 kWh/100 mi, 106 – 93 MPGe, 5.1 – 4.5 km/kWh, 3.1 – 2.8 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 | 2180 kg (4806.08 lbs.) |
| Max. weight | 2810 kg (6194.99 lbs.) |
| Max load | 630 kg (1388.91 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) | 11.6 m (38.06 ft.) |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
Powertrain & Engine Architecture
The E 300de’s powertrain centers around the OM 654 M, a 2.0-liter inline-four diesel engine. This engine utilizes a sophisticated diesel commonrail fuel injection system and a turbocharger with intercooling to deliver 197 horsepower at 3600 rpm and 440 Nm (324.53 lb-ft) of torque between 1800 and 2800 rpm. The engine features a double overhead camshaft (DOHC) valvetrain and a high compression ratio of 15.5:1, contributing to its efficiency. Integrated with the diesel engine is a synchronous electric motor, positioned between the engine and the 9G-TRONIC automatic transmission. This electric motor produces 129 horsepower and 440 Nm (324.53 lb-ft) of torque. The 9G-TRONIC transmission, a nine-speed automatic, is specifically calibrated to work seamlessly with both the diesel engine and the electric motor, optimizing for both fuel economy and performance. The combined system output of 313 horsepower and 700 Nm (516.29 lb-ft) allows for brisk acceleration.
Driving Characteristics
The E 300de offers a refined and versatile driving experience. In electric-only mode, it provides near-silent operation and instant torque, making it ideal for urban commuting. The all-electric range of 93-107 km (57.79 – 66.49 mi) is sufficient for many daily trips. When the diesel engine engages, the transition is remarkably smooth, and the combined power delivery provides confident acceleration. The 9G-TRONIC transmission contributes to this smoothness, offering quick and precise gear changes. Compared to the gasoline-powered E 300, the E 300de offers superior fuel economy and a more relaxed driving experience, particularly at lower speeds. While not as overtly sporty as some of the higher-performance E-Class variants, the E 300de provides ample power for highway cruising and overtaking.
Equipment & Trim Levels
The E 300de typically comes well-equipped, reflecting its premium positioning. Standard features often include Mercedes-Benz’s MBUX infotainment system with a large touchscreen display, a digital instrument cluster, leather upholstery, automatic climate control, and a comprehensive suite of safety features. Optional extras can include air suspension, premium sound systems, advanced driver-assistance systems (such as adaptive cruise control and lane-keeping assist), and various interior trim options. The interior design emphasizes luxury and comfort, with high-quality materials and meticulous attention to detail.
Chassis & Braking
The E 300de utilizes an independent multi-link suspension at both the front and rear, providing a comfortable and controlled ride. Air suspension is available as an option, further enhancing ride quality and allowing for adjustable ride height. The braking system features ventilated discs on all four wheels, providing ample stopping power. ABS (Anti-lock braking system) is standard, along with other electronic stability control systems. The steering is electric power-assisted, offering precise and responsive handling.
Market Reception & Comparison
The E 300de has been generally well-received by automotive critics, praised for its fuel efficiency, smooth powertrain, and luxurious interior. Its ability to operate in electric-only mode for significant distances is a major selling point, appealing to environmentally conscious buyers. Compared to other E-Class variants, such as the E 300 gasoline model, the E 300de offers superior fuel economy and lower emissions. However, it carries a higher price tag due to the added complexity of the plug-in hybrid system. Compared to the E 400d with its larger diesel engine, the E 300de offers a more balanced approach, prioritizing efficiency without sacrificing too much performance.
Legacy
The Mercedes-Benz E 300de represents a key step in the brand’s transition towards electrification. The OM 654 diesel engine, combined with the electric motor and 9G-TRONIC transmission, has proven to be a reliable and efficient powertrain. While long-term reliability data is still emerging, early indications suggest that the hybrid system is robust and durable. On the used car market, the E 300de is expected to hold its value well, particularly as demand for plug-in hybrid vehicles continues to grow. Its combination of luxury, efficiency, and technology makes it a compelling option for buyers seeking a sophisticated and environmentally friendly executive sedan.
