The Mercedes-Benz S 450e, introduced in May 2022 as part of the W223 generation of the S-Class, represents the brand’s foray into plug-in hybrid technology within its flagship sedan range. Production is anticipated to continue through 2026. This variant combines a 3.0-liter inline-six cylinder gasoline engine with an electric motor and a substantial battery pack, offering a blend of luxury, performance, and improved fuel efficiency. The S 450e occupies a mid-range position within the W223 lineup, positioned between the conventionally powered S 450 and the higher-performance S 580 models, as well as the fully electric EQS.
Powertrain & Engine Architecture
The S 450e utilizes a sophisticated plug-in hybrid (PHEV) powertrain centered around the M 256.930 engine. This is a 2,999 cc (183.01 cu. in.) inline-six cylinder engine featuring direct fuel injection and a twin-scroll turbocharger with intercooling. The engine produces 299 hp and 450 Nm (331.9 lb-ft) of torque. The engine’s design incorporates a NANOSLIDE cylinder coating to reduce friction and improve efficiency. Valvetrain is a DOHC (Double Overhead Camshaft) configuration with four valves per cylinder.
Integrated with the gasoline engine is a 150 hp electric motor, delivering 440 Nm (324.53 lb-ft) of torque. This motor is strategically positioned between the combustion engine and the 9G-TRONIC automatic transmission. The combined system output reaches 408 hp and 650 Nm (479.42 lb-ft) of torque. Power is delivered to the rear wheels. The battery pack, utilizing Lithium-ion (Li-Ion) technology, has a gross capacity of 28.6 kWh and a usable capacity of 21.96 kWh, located under the trunk floor. This allows for an all-electric range of 96-115 km (59.65 – 71.46 mi) based on WLTP testing.
The 9G-TRONIC automatic transmission, a nine-speed unit, is specifically calibrated for the hybrid powertrain. It features a wide gear ratio spread to optimize both fuel economy and performance. The transmission’s control unit seamlessly manages the interaction between the gasoline engine and the electric motor, allowing for smooth transitions and efficient power delivery.
Fuel Injection and Emissions
The M 256.930 engine employs a third-generation direct injection system operating at a maximum pressure of 350 bar. This high-pressure injection ensures precise fuel metering and efficient combustion. The S 450e meets Euro 6e emission standards and is equipped with a particulate filter to further reduce emissions. Combined CO2 emissions are rated at 14-20 g/km (WLTP).
Driving Characteristics
The S 450e offers a distinct driving experience compared to its conventionally powered S-Class siblings. In electric mode, the vehicle provides near-silent acceleration and instant torque, making it ideal for urban driving. The electric motor’s 440 Nm of torque is readily available, providing brisk acceleration from a standstill. The 0-100 km/h (0-62 mph) sprint takes 5.9 seconds, and 0-60 mph is achieved in approximately 5.6 seconds.
When the gasoline engine engages, the combined power output delivers strong and refined acceleration. The 9G-TRONIC transmission provides smooth and seamless gear changes, enhancing the overall driving experience. The hybrid system intelligently manages power delivery, prioritizing electric drive whenever possible and seamlessly transitioning to gasoline power when needed. The car is electronically limited to a top speed of 250 km/h (155.34 mph).
Compared to the S 580 with its V8 engine, the S 450e offers a more balanced driving experience, prioritizing efficiency without sacrificing significant performance. While the S 580 provides more raw power, the S 450e’s electric boost and refined powertrain deliver a uniquely engaging driving experience.
Equipment & Trim Levels
The S 450e is generously equipped with standard features befitting a flagship luxury sedan. Standard interior appointments include premium leather upholstery, wood trim, and a comprehensive suite of driver-assistance systems. The MBUX infotainment system, with its large touchscreen displays and advanced voice control, is standard. Features like heated and ventilated front seats, a panoramic sunroof, and a premium sound system are also typically included.
Optional extras include a variety of customization options, such as different leather colors, trim materials, and wheel designs. Advanced driver-assistance features, such as adaptive cruise control, lane-keeping assist, and automatic parking, are available as options. The S 450e can also be equipped with rear-seat entertainment systems and executive seating packages.
Chassis & Braking
The S 450e utilizes an independent multi-link suspension system at both the front and rear, enhanced with air suspension. This provides a comfortable and controlled ride, even on uneven surfaces. The air suspension system automatically adjusts the ride height based on driving conditions and load, further optimizing comfort and handling. The vehicle also features 4-wheel steering (4WS), which improves maneuverability at low speeds and stability at high speeds.
The braking system consists of ventilated discs at all four corners, providing ample stopping power. Anti-lock braking system (ABS) is standard, along with electronic brake-force distribution and brake assist. The regenerative braking system captures energy during deceleration, helping to recharge the battery and improve efficiency.
Market Reception & Comparison
The S 450e has been generally well-received by automotive critics, praised for its luxurious interior, refined driving experience, and impressive fuel efficiency. The plug-in hybrid powertrain offers a compelling alternative to traditional gasoline engines, allowing for zero-emission driving in certain situations. Critics have noted the relatively small trunk space due to the battery pack, but acknowledge that this is a common trade-off for plug-in hybrid vehicles.
Compared to the S 450, the S 450e offers significantly improved fuel economy and the ability to drive in all-electric mode. Compared to the S 580, the S 450e provides a more balanced combination of performance and efficiency. Fuel consumption is rated at 0.6-0.9 l/100 km (392 – 261.3 US mpg, 470.8 – 313.9 UK mpg, 166.7 – 111.1 km/l), a substantial improvement over the non-hybrid models.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-Class |
| Generation | S-Class (W223) |
| Type | S 450e (408 Hp) Plug-in Hybrid 9G-TRONIC |
| Start of production | May, 2022 |
| End of production | 2026 |
| Powertrain Architecture | PHEV (Plug-in Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 0.6-0.9 l/100 km |
| CO2 emissions (WLTP) | 14-20 g/km |
| Fuel Type | Petrol / electricity |
| Acceleration 0 – 100 km/h | 5.9 sec |
| Acceleration 0 – 62 mph | 5.9 sec |
| Acceleration 0 – 60 mph | 5.6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Gross battery capacity | 28.6 kWh |
| Net (usable) battery capacity | 21.96 kWh |
| All-electric range (WLTP) | 96-115 km (59.65 – 71.46 mi) |
| Engine Power | 299 Hp |
| Engine Torque | 450 Nm (331.9 lb-ft) |
| Engine Displacement | 2999 cm3 (183.01 cu. in.) |
| Electric motor power | 150 Hp |
| Electric motor Torque | 440 Nm (324.53 lb.-ft.) |
| System power | 408 Hp |
| System torque | 650 Nm (479.42 lb.-ft.) |
| Kerb Weight | 2335 kg (5147.79 lbs.) |
| Trunk (boot) space – minimum | 350 l (12.36 cu. ft.) |
| Fuel tank capacity | 67 l (17.7 US gal | 14.74 UK gal) |
| Length | 5179 mm (203.9 in.) |
| Width | 1954 mm (76.93 in.) |
| Height | 1503 mm (59.17 in.) |
Legacy
The S 450e represents a significant step forward in Mercedes-Benz’s commitment to electrification. While long-term reliability data is still emerging, the M 256 engine family has proven to be robust and reliable in other applications. The hybrid powertrain components are expected to have a long service life, and the battery pack is covered by an eight-year/160,000 km (100,000 miles) warranty. On the used car market, the S 450e is expected to hold its value well due to its luxurious features, advanced technology, and fuel efficiency. As concerns about environmental impact and fuel costs continue to grow, the S 450e is likely to become an increasingly desirable option for luxury car buyers.
