The Mercedes-Benz S 450 4MATIC, part of the V222 facelift generation of the S-Class Long wheelbase, was produced from 2017 to 2020. This model represented a significant step in luxury sedan technology, incorporating a mild-hybrid system (EQ Boost) to enhance both performance and efficiency. Positioned as a mid-range offering within the S-Class lineup, it slotted between the S 350 d and the more powerful S 560 models. The “Long” designation indicates an extended wheelbase, prioritizing rear passenger space – a key feature for markets like China and the United States where chauffeur-driven luxury is prevalent. This variant aimed to balance refinement, power, and fuel economy for discerning buyers.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V222, facelift 2017) |
| Type (Engine) | S 450 (367 Hp) EQ Boost 4MATIC G-TRONIC |
| Start of production | 2017 year |
| End of production | 2020 year |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption at Low speed (WLTP) | 8.5 l/100 km (27.7 US mpg) |
| Fuel consumption at very high speed (WLTP) | 9.2 l/100 km (25.6 US mpg) |
| CO2 emissions (WLTP) | 193-209 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 | 4.9 sec |
| Acceleration 0 – 62 mph | 4.9 sec |
| Acceleration 0 – 60 mph | 4.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.4 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 | 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 layout | Front, Longitudinal |
| Engine Model/Code | M 256.930 |
| 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 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-scroll turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant | 13.2 l (13.95 US qt | 11.61 UK qt) |
| Kerb Weight | 2000 kg (4409.25 lbs.) |
| Max. weight | 2760 kg (6084.76 lbs.) |
| Max load | 760 kg (1675.51 lbs.) |
| Trunk (boot) space – minimum | 530 l (18.72 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 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.) |
| Length | 5271 mm (207.52 in.) |
| Width | 1905 mm (75 in.) |
| Width including mirrors | 2130 mm (83.86 in.) |
| Height | 1496 mm (58.9 in.) |
| Wheelbase | 3165 mm (124.61 in.) |
| Front track | 1630 mm (64.17 in.) |
| Rear (Back) track | 1643 mm (64.69 in.) |
| Front overhang | 898 mm (35.35 in.) |
| Rear overhang | 1208 mm (47.56 in.) |
| Drag coefficient (Cd) | 0.27 |
| Minimum turning circle (turning diameter) | 12.3 m (40.35 ft.) |
| Drivetrain Architecture | ICE and electric motor drive all four wheels |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/50 R18 |
| Wheel rims size | 8J x 18 |
Powertrain & Engine Architecture
The S 450 4MATIC is powered by the M 256.930 3.0-liter inline-six cylinder engine. This engine is a key example of Mercedes-Benz’s move towards downsizing and turbocharging. It features direct injection, a twin-scroll turbocharger, and an intercooler to maximize power and efficiency. The engine produces 367 horsepower at 5500-6100 rpm and 500 Nm (368.78 lb-ft) of torque between 1600-4000 rpm. What sets this engine apart is its integration with a 48-volt mild-hybrid system, known as EQ Boost. This system adds an additional 22 horsepower and 250 Nm (184.39 lb-ft) of torque, providing seamless assistance during acceleration and enabling features like coasting with the engine off to improve fuel economy. The engine is paired with a 9G-TRONIC nine-speed automatic transmission, which is known for its smooth shifts and wide gear ratio spread. The transmission is designed to work in conjunction with the EQ Boost system, optimizing gear selection for both performance and efficiency.
Driving Characteristics
The S 450 4MATIC delivers a refined and powerful driving experience. The EQ Boost system provides instant torque, eliminating any noticeable turbo lag and resulting in brisk acceleration – 0 to 60 mph in approximately 4.7 seconds. While not as overtly sporty as some of its competitors, the S 450 offers ample power for effortless highway cruising and confident overtaking. The 9G-TRONIC transmission contributes to a smooth and comfortable ride, with well-spaced gear ratios that keep the engine in its optimal power band. Compared to the S 350 d, the S 450 offers significantly more power and a more responsive feel. However, it doesn’t quite match the outright performance of the S 560, which boasts a larger V8 engine. The all-wheel-drive system provides excellent traction in all weather conditions, enhancing stability and control.
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 premium Burmester sound system, a large infotainment display with Mercedes’ MBUX system, and a panoramic sunroof. Standard safety features included adaptive cruise control, lane-keeping assist, automatic emergency braking, and a 360-degree camera system. Optional extras included rear-seat entertainment systems, upgraded leather packages, and various driver-assistance features. The interior design emphasized elegance and sophistication, with high-quality materials and meticulous attention to detail. The dashboard featured a dual-screen display, providing a wealth of information and control options for the driver and passenger.
Chassis & Braking
The S 450 4MATIC utilizes an independent multi-link suspension system at both the front and rear axles. This suspension setup is designed to provide a comfortable and controlled ride, absorbing bumps and imperfections in the road surface effectively. Air suspension was often equipped, further enhancing ride quality and allowing the vehicle’s ride height to be adjusted. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Anti-lock braking system (ABS), electronic stability control (ESC), and brake assist are standard features, enhancing safety and control. The steering system is a rack-and-pinion setup with electric power steering, offering precise and responsive handling.
Market Reception & Comparison
The S 450 4MATIC was generally well-received by automotive critics. It was praised for its refined driving experience, luxurious interior, and advanced technology. The EQ Boost system was seen as a significant step forward in terms of efficiency and performance. Compared to its competitors, such as the BMW 740i and the Audi A8, the S 450 offered a compelling combination of luxury, technology, and performance. Fuel economy was competitive for its class, with combined fuel consumption figures ranging from 7.0 to 7.3 l/100 km. Reliability has been generally good, although some owners have reported minor issues with the infotainment system and electronic components.
Legacy
The Mercedes-Benz S 450 4MATIC (V222 facelift) represents a pivotal moment in the evolution of the S-Class. Its introduction of the EQ Boost mild-hybrid system paved the way for the more extensive electrification seen in later models. On the used car market, these vehicles hold their value relatively well, due to their reputation for luxury, reliability, and advanced technology. The M 256 engine has proven to be a durable and capable powerplant, and with proper maintenance, these vehicles are expected to provide many years of reliable service. The S 450 4MATIC remains a desirable choice for buyers seeking a luxurious and technologically advanced sedan.
