The Mercedes-Benz S-Class Long (V223) S 450 4MATIC, produced from June 2023 through 2026, represents a significant iteration of the flagship S-Class sedan. This variant, distinguished by its extended wheelbase (“Long” designation) and sophisticated mild-hybrid powertrain, occupies a central position within the V223 range, offering a balance of performance, luxury, and efficiency. It’s designed primarily for markets where rear passenger space is highly valued, such as China, and is offered in North America as a premium option. The S 450 4MATIC builds upon the established S-Class legacy of innovation and refinement, incorporating advanced technology and a focus on passenger comfort.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V223) |
| Type | S 450 (381 Hp) EQ Boost 4MATIC 9G-TRONIC |
| Start of production | June, 2023 |
| End of production | 2026 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 4-5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 8.1-9.2 l/100 km (29 – 25.6 US mpg) |
| CO2 emissions (WLTP) | 184-211 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5 sec |
| Acceleration 0 – 62 mph | 5 sec |
| Acceleration 0 – 60 mph | 4.8 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 5.3 kg/Hp |
| Weight-to-torque ratio | 4 kg/Nm |
| Gross battery capacity | 0.9 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 23 Hp |
| Electric motor Torque | 250 Nm (184.39 lb.-ft.) |
| Power | 381 Hp |
| Torque | 500 Nm (368.78 lb.-ft.) |
| Engine displacement | 2999 cm3 (183.01 cu. in.) |
| Number of cylinders | 6 |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 256.830 |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 92.4 mm (3.64 in.) |
| Compression ratio | 10.5:1 |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant capacity | 13 l (13.74 US qt | 11.44 UK qt) |
| Kerb Weight | 2015 kg (4442.31 lbs.) |
| Max. weight | 2820 kg (6217.04 lbs.) |
| Max load | 805 kg (1774.72 lbs.) |
| Trunk (boot) space – minimum | 550 l (19.42 cu. ft.) |
| Fuel tank capacity | 65 l (17.17 US gal | 14.3 UK gal) |
| Length | 5289 mm (208.23 in.) |
| Width | 1954 mm (76.93 in.) |
| Height | 1503 mm (59.17 in.) |
| Wheelbase | 3216 mm (126.61 in.) |
| Number of gears | 9 |
| Gearbox type | Automatic transmission G-TRONIC |
Powertrain & Engine Architecture
The S 450 4MATIC is powered by the M 256.830 3.0-liter inline-six cylinder engine, a cornerstone of Mercedes-Benz’s modern engine lineup. This engine utilizes a sophisticated combination of technologies, including direct fuel injection, a twin-scroll turbocharger, and an intercooler, to deliver a potent 381 horsepower and 500 Nm (368.78 lb-ft) of torque. Crucially, this engine incorporates Mercedes-Benz’s EQ Boost mild-hybrid system. This system features a 48-volt electrical architecture and integrates a 23 horsepower electric motor between the engine and the 9G-TRONIC automatic transmission. The electric motor provides assistance during acceleration, allowing for smoother starts and improved fuel efficiency. The 9G-TRONIC transmission itself is a nine-speed automatic known for its smooth shifting and wide gear ratios, optimized for both comfort and efficiency. The engine’s valvetrain employs a Double Overhead Camshaft (DOHC) configuration with four valves per cylinder, enhancing breathing and overall performance.
Driving Characteristics
The S 450 4MATIC delivers a driving experience characterized by effortless power and refined comfort. The EQ Boost system provides an immediate boost in torque, resulting in brisk acceleration – 0 to 60 mph in approximately 4.8 seconds. While not as overtly sporty as some of its competitors, the S 450 offers ample power for confident overtaking and highway cruising. The 9G-TRONIC transmission contributes to a seamless driving experience, with gear changes being virtually imperceptible. Compared to higher-performance S-Class variants like the S 580, the S 450 prioritizes smoothness and fuel economy over outright speed. The long wheelbase contributes to a stable and comfortable ride, effectively absorbing road imperfections. The 4MATIC all-wheel-drive system provides excellent traction in various weather conditions.
Equipment & Trim Levels
The S 450 4MATIC comes standard with a comprehensive suite of luxury features. Interior appointments typically include premium leather upholstery, wood trim, and ambient lighting. Standard technology features include the Mercedes-Benz User Experience (MBUX) infotainment system with a large touchscreen display, a digital instrument cluster, and a premium sound system. Available options include massaging seats, a rear-seat entertainment system, and advanced driver-assistance systems such as adaptive cruise control, lane-keeping assist, and automatic emergency braking. The extended wheelbase provides significantly more rear legroom compared to the standard-wheelbase S-Class, making it particularly appealing to chauffeur-driven buyers.
Chassis & Braking
The S 450 4MATIC features an independent multi-link suspension at both the front and rear, coupled with Mercedes-Benz’s AIRMATIC air suspension system. This combination provides a remarkably comfortable ride, automatically adjusting the suspension to optimize ride quality and handling. The air suspension also allows for adjustable ride height. Braking duties are handled by ventilated discs on all four wheels, providing ample stopping power. Standard safety features include ABS (Anti-lock Braking System) and Electronic Stability Program (ESP). Available options include 4-wheel steering, which enhances maneuverability at low speeds and stability at high speeds.
Market Reception & Comparison
The S 450 4MATIC has been generally well-received by automotive critics, praised for its luxurious interior, comfortable ride, and advanced technology. Its fuel economy, ranging from 25.6 to 29 US mpg, is competitive within the luxury sedan segment, particularly considering its size and performance. Compared to the S 580, the S 450 offers a more accessible entry point into the S-Class range, while still delivering a high level of luxury and refinement. Some reviewers have noted that the S 450’s performance, while adequate, may not be as exhilarating as that of its more powerful siblings. However, the S 450’s focus on comfort and efficiency makes it a compelling choice for buyers who prioritize a relaxed and refined driving experience.
Legacy
The M 256 engine family, including the version found in the S 450 4MATIC, has proven to be a reliable and durable powertrain. Early reports suggest good long-term reliability, although the complexity of the mild-hybrid system may require specialized maintenance. On the used car market, the V223 S-Class, including the S 450 4MATIC, is expected to hold its value well due to its reputation for luxury, technology, and build quality. The combination of a powerful inline-six engine, a sophisticated mild-hybrid system, and a luxurious interior positions the S 450 4MATIC as a significant and desirable iteration of the iconic Mercedes-Benz S-Class.
