The Mercedes-Benz S-Class Long (V223) S 450d 4MATIC, produced from May 2023, represents a significant iteration of the flagship S-Class sedan. This variant, distinguished by its extended wheelbase (“Long” designation) and potent diesel engine with EQ Boost technology, occupies a key position within the V223 generation, offering a blend of luxury, performance, and efficiency. It caters to buyers seeking a spacious, technologically advanced sedan with a focus on refined driving dynamics. Production is expected to continue through 2026.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V223) |
| Type | S 450d (367 Hp) EQ Boost 4MATIC 9G-TRONIC |
| Start of production | May, 2023 |
| End of production | 2026 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 4-5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 6.2-7.1 l/100 km (37.9 – 33.1 US mpg, 45.6 – 39.8 UK mpg, 16.1 – 14.1 km/l) |
| CO2 emissions (WLTP) | 163-186 g/km |
| Fuel Type | Diesel |
| 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 | 5.6 kg/Hp, 177.3 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 362.3 Nm/tonne |
| 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.) |
| Electric motor location | Between the combustion engine and the transmission |
| Power | 367 Hp @ 4000 rpm |
| Torque | 750 Nm @ 1350-2800 rpm (553.17 lb.-ft. @ 1350-2800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 656.830 |
| Engine displacement | 2989 cm3 (182.4 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Compression ratio | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | BiTurbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant | 12 l (12.68 US qt | 10.56 UK qt) |
| Kerb Weight | 2070 kg (4563.57 lbs.) |
| Max. weight | 2820 kg (6217.04 lbs.) |
| Max load | 750 kg (1653.47 lbs.) |
| Trunk (boot) space – minimum | 540 l (19.07 cu. ft.) |
| Fuel tank capacity | 65 l (17.17 US gal | 14.3 UK gal) |
| AdBlue tank | 25 l (6.6 US gal | 5.5 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.) |
| Permitted towbar download | 85 kg (187.39 lbs.) |
| Length | 5289 mm (208.23 in.) |
| Width | 1954 mm (76.93 in.) |
| Width including mirrors | 2109 mm (83.03 in.) |
| Height | 1503 mm (59.17 in.) |
| Wheelbase | 3216 mm (126.61 in.) |
| Front track | 1655 mm (65.16 in.) |
| Rear (Back) track | 1651 mm (65 in.) |
| Front overhang | 877 mm (34.53 in.) |
| Rear overhang | 1196 mm (47.09 in.) |
| Ride height (ground clearance) | 130 mm (5.12 in.) |
| Minimum turning circle (turning diameter) | 10.9 m (35.76 ft.) |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
Powertrain & Engine Architecture
The S 450d 4MATIC is powered by the OM 656.830, a 3.0-liter inline-six cylinder diesel engine. This engine is a cornerstone of Mercedes-Benz’s modern diesel offerings, known for its efficiency and refinement. It utilizes a sophisticated diesel commonrail fuel injection system and a bi-turbocharger setup with an intercooler, delivering 367 horsepower at 4000 rpm and a substantial 750 Nm (553.17 lb-ft) of torque between 1350 and 2800 rpm. The engine features a high compression ratio of 15.5:1 and a DOHC valvetrain. Crucially, this variant incorporates a 48-volt mild hybrid system (EQ Boost). This system adds an electric motor producing 23 hp and 250 Nm (184.39 lb-ft) of torque, integrated between the engine and the 9G-TRONIC automatic transmission. The EQ Boost system enables features like extended coasting, smoother start/stop operation, and a slight power boost during acceleration. The 9G-TRONIC transmission, a nine-speed automatic, is meticulously calibrated to work in harmony with the engine’s torque curve, providing smooth and efficient gear changes.
Driving Characteristics
The S 450d 4MATIC offers a compelling driving experience, prioritizing comfort and effortless performance. The combination of the powerful diesel engine and the 9G-TRONIC transmission results in strong acceleration – 0 to 60 mph in approximately 4.8 seconds. While not as overtly sporty as some of the gasoline-powered S-Class variants, the S 450d delivers ample power for confident overtaking and highway cruising. The EQ Boost system contributes to a remarkably smooth and refined power delivery. The long wheelbase contributes to a stable and comfortable ride, further enhanced by the standard air suspension. The 9G-TRONIC transmission’s gear ratios are optimized for both fuel efficiency and responsive acceleration, ensuring the engine operates within its peak torque band for most driving situations.
Equipment & Trim Levels
The S 450d 4MATIC, as a flagship model, comes standard with a comprehensive suite of luxury features. These typically include premium leather upholstery, heated and ventilated front and rear seats, a Burmester surround sound system, a large touchscreen infotainment system with MBUX (Mercedes-Benz User Experience), and a host of advanced driver-assistance systems such as adaptive cruise control, lane-keeping assist, and automatic emergency braking. Optional extras often include features like a rear-seat entertainment system, massaging seats, and various interior trim options. The “Long” designation signifies an extended wheelbase, providing significantly more rear legroom compared to the standard-wheelbase S-Class.
Chassis & Braking
The S 450d 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 supremely comfortable ride quality, automatically adjusting the suspension to road conditions. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Standard 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 450d 4MATIC has been generally well-received by automotive critics, praised for its blend of luxury, performance, and fuel efficiency. Compared to the S 580 (gasoline V8) variant, the S 450d offers comparable performance with significantly improved fuel economy. The diesel engine’s higher torque output also provides a different driving character, favoring effortless cruising over outright acceleration. Compared to other diesel-powered luxury sedans, the S 450d stands out for its refinement, advanced technology, and spacious interior. Reliability has been generally good, although diesel engines can be more sensitive to fuel quality than gasoline engines.
Legacy
The OM 656 engine family, including the OM 656.830 found in the S 450d, is expected to be a durable and reliable powertrain. Mercedes-Benz has a strong track record with its diesel engines, and the inclusion of the EQ Boost system is expected to further enhance longevity by reducing stress on the engine. In the used car market, the V223 S-Class, including the S 450d 4MATIC, is expected to hold its value well due to its luxurious features, advanced technology, and reputation for quality. The combination of a powerful diesel engine, mild-hybrid technology, and a spacious, comfortable interior makes this variant a compelling choice for buyers seeking a refined and efficient luxury sedan.
