The Mercedes-Benz S-Class Long (V223) S 450 4MATIC, produced from 2020 through April 2023, represents a significant iteration of the flagship S-Class sedan. This variant, distinguished by its extended wheelbase (“Long” designation) and mild-hybrid powertrain, occupied a key position in the V223 lineup, offering a balance of performance, luxury, and efficiency. It was primarily aimed at markets where larger, more opulent sedans are favored, including China, and served as a stepping stone between the base S 350 and the more performance-oriented S 580 models. The S 450 4MATIC utilized Mercedes-Benz’s advanced technology suite, emphasizing comfort and driver assistance features.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V223) |
| Type | S 450 (367 Hp) EQ Boost 4MATIC 9G-TRONIC |
| Start of production | 2020 |
| End of production | April, 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 4-5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 7.8-9.5 l/100 km (30.2 – 24.8 US mpg) |
| CO2 emissions (WLTP) | 178-215 g/km |
| Fuel consumption (urban – NEDC) | 10.9-11.3 l/100 km (21.6 – 20.8 US mpg) |
| Fuel consumption (extra urban – NEDC) | 6-6.6 l/100 km (39.2 – 35.6 US mpg) |
| Fuel consumption (combined – NEDC) | 7.8-8.4 l/100 km (30.2 – 28 US mpg) |
| CO2 emissions (NEDC) | 178-191 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 6D-ISC-FCM |
| 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 @ 1600-4500 rpm (368.78 lb.-ft. @ 1600-4500 rpm) |
| Engine displacement | 2999 cm3 (183.01 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| 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 | 2820 kg (6217.04 lbs.) |
| Trunk (boot) space | 550 l (19.42 cu. ft.) |
| Fuel tank capacity | 65 l (17.17 US gal) |
| Length | 5289 mm (208.23 in.) |
| Width | 1921-1954 mm (75.63 – 76.93 in.) |
| Height | 1503 mm (59.17 in.) |
| Wheelbase | 3216 mm (126.61 in.) |
| Number of gears | 9 |
| Gearbox type | Automatic (9G-TRONIC) |
Powertrain & Engine Architecture
The S 450 4MATIC is powered by Mercedes-Benz’s M 256.930 3.0-liter inline-six cylinder engine. This engine is a key component of the company’s modular engine family and features several advanced technologies. It utilizes direct fuel injection, a twin-scroll turbocharger with intercooling, and a sophisticated valvetrain (DOHC) to deliver a balance of power and efficiency. The engine’s output of 367 horsepower and 500 Nm (368.78 lb-ft) of torque is augmented by a 48-volt mild-hybrid system, known as EQ Boost. This system incorporates an integrated starter-generator (ISG) that provides an additional 22 horsepower and 250 Nm (184.39 lb-ft) of torque, enabling features like smoother start/stop operation and a degree of electric assistance during acceleration. The engine is paired with Mercedes-Benz’s 9G-TRONIC nine-speed automatic transmission, which is known for its smooth shifting and wide gear ratio spread. The transmission is designed to work seamlessly with the mild-hybrid system, optimizing fuel economy and performance.
Driving Characteristics
The S 450 4MATIC offers a refined and comfortable driving experience. The combination of the inline-six engine, mild-hybrid system, and nine-speed automatic transmission results in smooth and effortless acceleration. While not as overtly sporty as the S 580 with its V8 engine, the S 450 delivers more than adequate performance for most driving situations, achieving a 0-60 mph time of around 4.8 seconds. The 9G-TRONIC transmission is programmed for comfort, with quick and almost imperceptible gear changes. The EQ Boost system provides a noticeable boost during acceleration, filling in any gaps in torque delivery. The long wheelbase contributes to a stable and composed ride, even at higher speeds. Compared to the S 350, the S 450 offers a significant performance upgrade, while remaining more fuel-efficient than the S 580.
Equipment & Trim Levels
The S 450 4MATIC came standard with a comprehensive array of luxury features. These included leather upholstery, heated and ventilated front seats with massage functions, a Burmester surround sound system, a large dual-screen display for the infotainment system and digital instrument cluster, and a panoramic sunroof. Standard driver assistance features included adaptive cruise control, lane keeping assist, automatic emergency braking, and a 360-degree camera system. Optional extras included rear-seat entertainment systems, premium leather packages, and various cosmetic enhancements. The interior design emphasized a minimalist aesthetic with high-quality materials and meticulous attention to detail.
Chassis & Braking
The S-Class Long (V223) utilizes an independent multi-link suspension system at both the front and rear, enhanced by Mercedes-Benz’s AIRMATIC air suspension. This system provides a remarkably smooth and comfortable ride, automatically adjusting the suspension damping and ride height based on road conditions and driving style. The S 450 4MATIC is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Additional safety features include ABS (Anti-lock braking system) and 4-wheel steering (4WS), which enhances maneuverability at low speeds and stability at high speeds.
Market Reception & Comparison
The S 450 4MATIC was generally well-received by automotive critics. It was praised for its luxurious interior, comfortable ride, and advanced technology. The mild-hybrid powertrain was also lauded for its ability to improve fuel economy without sacrificing performance. Compared to the S 350, the S 450 offered a noticeable performance upgrade, making it a more appealing option for drivers who wanted a bit more power. However, it was more expensive than the S 350. Compared to the S 580, the S 450 offered a more balanced combination of performance and efficiency, making it a good choice for those who didn’t need the extra power of the V8 engine. Fuel economy figures ranged from 7.8-9.5 l/100 km (30.2 – 24.8 US mpg) depending on driving conditions.
Legacy
The Mercedes-Benz S-Class Long (V223) S 450 4MATIC represents a pivotal step in the evolution of the S-Class, integrating mild-hybrid technology into its flagship sedan. While relatively new to the used car market, early reports suggest good long-term reliability, particularly with the engine and transmission. The M 256 engine family has proven to be robust, and the 9G-TRONIC transmission is known for its durability. As these vehicles age, maintenance costs are expected to be moderate, consistent with other luxury sedans. The S 450 4MATIC is likely to remain a desirable option for buyers seeking a luxurious, comfortable, and technologically advanced sedan.
