The Mercedes-Benz S 450, part of the V222 facelift generation of the S-Class Long wheelbase model produced from 2017 to 2020, represents a sophisticated blend of luxury, performance, and emerging mild-hybrid technology. Positioned as a mid-range offering within the S-Class lineup, it slotted between the entry-level S 350 d and the higher-performance S 560 models. This variant was primarily aimed at buyers seeking a refined driving experience with a balance of power and efficiency, particularly in markets where larger, long-wheelbase sedans are highly valued. The introduction of EQ Boost technology marked a significant step towards electrification for the flagship S-Class.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V222, facelift 2017) |
| Type (Engine) | S 450 (367 Hp) EQ Boost G-TRONIC |
| Start of production | 2017 |
| End of production | 2020 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption at Low speed (WLTP) | 7.8 l/100 km (30.2 US mpg) |
| Fuel consumption at very high speed (WLTP) | 8.5 l/100 km (27.7 US mpg) |
| CO2 emissions (WLTP) | 177-193 g/km |
| Fuel consumption (economy) – urban | 9.3-9.6 l/100 km (25.3 – 24.5 US mpg) |
| Fuel consumption (economy) – extra urban | 5.6-6.0 l/100 km (42 – 39.2 US mpg) |
| Fuel consumption (economy) – combined | 7.0-7.3 l/100 km (33.6 – 32.2 US mpg) |
| CO2 emissions | 159-167 g/km |
| Fuel Type | Petrol (Gasoline) |
| 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 | 5.3 kg/Hp |
| Weight-to-torque ratio | 3.9 kg/Nm |
| Gross battery capacity | 0.9 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 22 Hp |
| Electric motor Torque | 250 Nm (184.39 lb.-ft.) |
| Power | 367 Hp @ 5500-6100 rpm |
| Torque | 500 Nm @ 1600-4000 rpm (368.78 lb.-ft. @ 1600-4000 rpm) |
| Engine displacement | 2999 cm3 (183.01 cu. in.) |
| Number of cylinders | 6 |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 256.930 |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 92.4 mm (3.64 in.) |
| Compression ratio | 10.5:1 |
| Kerb Weight | 1940 kg (4276.97 lbs.) |
| Max. weight | 2700 kg (5952.48 lbs.) |
| Trunk (boot) space – minimum | 530 l (18.72 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal) |
| Length | 5271 mm (207.52 in.) |
| Width | 1905 mm (75 in.) |
| Height | 1496 mm (58.9 in.) |
| Wheelbase | 3165 mm (124.61 in.) |
| Number of gears | 9 |
| Gearbox type | automatic transmission G-TRONIC |
Powertrain & Engine Architecture
The S 450 is powered by the M 256.930 3.0-liter inline-6 engine, a marvel of modern engineering. This engine utilizes direct injection and is augmented by a twin-scroll turbocharger and intercooler, delivering 367 horsepower and 500 Nm (368.78 lb-ft) of torque. What sets this engine apart is its integration with a 48-volt mild-hybrid system (EQ Boost). This system incorporates a 22 horsepower electric motor positioned between the engine and the 9-speed G-TRONIC automatic transmission. The electric motor provides assistance during acceleration, allowing for smoother starts and improved responsiveness. The 48V system also powers ancillary components, reducing the load on the engine and contributing to fuel efficiency. The engine’s architecture prioritizes refinement and efficiency, employing technologies like NANOSLIDE cylinder coating to minimize friction.
Driving Characteristics
The S 450’s driving experience is characterized by its smoothness and effortless power delivery. The EQ Boost system effectively fills in torque gaps, making the engine feel more responsive than its displacement might suggest. While not as overtly sporty as the V8-powered S 560, the S 450 offers ample acceleration – achieving 0-60 mph in approximately 4.8 seconds. The 9-speed G-TRONIC transmission provides seamless gear changes, contributing to a relaxed and comfortable ride. Compared to the diesel-powered S 350 d, the S 450 offers a more refined and responsive engine character, albeit with slightly higher fuel consumption. The long wheelbase contributes to a stable and composed ride, even at higher speeds.
Equipment & Trim Levels
The S 450 came standard with a comprehensive array of luxury features, befitting its flagship status. These included leather upholstery, heated and ventilated front seats with massage functions, a premium Burmester sound system, and a large infotainment display with Mercedes’ MBUX system. Standard safety features included adaptive cruise control, lane-keeping assist, and automatic emergency braking. Optional extras included rear-seat entertainment, a panoramic sunroof, and various interior trim upgrades. The interior design emphasized elegance and sophistication, with high-quality materials and meticulous attention to detail.
Chassis & Braking
The S 450 features an independent multi-link suspension at both the front and rear, providing a comfortable and controlled ride. The suspension is electronically controlled, adapting to road conditions and driving style. Braking duties are handled by ventilated discs on all four wheels, providing ample stopping power. The car is equipped with ABS (Anti-lock braking system) and electronic stability control. The steering is electrically assisted, offering precise and responsive handling. The long wheelbase and carefully tuned suspension contribute to a stable and composed ride, even when cornering.
Market Reception & Comparison
The S 450 was generally well-received by automotive critics, who praised its refined engine, comfortable ride, and luxurious interior. The EQ Boost system was seen as a positive step towards electrification, offering a noticeable improvement in responsiveness and fuel efficiency. Compared to the S 350 d, the S 450 was considered a more desirable option for buyers prioritizing refinement and performance. However, some critics noted that the S 450 didn’t quite match the outright performance of the V8-powered S 560. Fuel economy figures were competitive for its class, averaging around 33.6-32.2 US mpg in combined driving.
Legacy
The Mercedes-Benz S 450 (V222 facelift) represents an important transitional model in the S-Class lineage. Its introduction of mild-hybrid technology paved the way for the more extensive electrification seen in subsequent generations. The M 256 inline-6 engine has proven to be a reliable and durable powerplant, and well-maintained examples continue to command strong prices in the used car market. While not the most powerful S-Class variant, the S 450 offers a compelling combination of luxury, performance, and efficiency, making it a desirable choice for discerning buyers seeking a refined and sophisticated driving experience.
