The Mercedes-Benz S 450 4MATIC, produced between 2009 and 2010, represented a significant iteration of the V221 S-Class long-wheelbase sedan. Positioned as a mid-range offering within the facelifted V221 lineup, it bridged the gap between the entry-level S 350 and the more powerful S 550 and S 63 AMG models. This variant combined a naturally aspirated 4.7-liter V8 engine with Mercedes-Benz’s 7G-TRONIC seven-speed automatic transmission and the added security of the 4MATIC all-wheel-drive system, targeting buyers seeking a blend of performance, luxury, and all-weather capability. The “facelift” or second series (also known as the Mopf2) brought styling updates, revised engine options, and enhanced technology compared to the original V221 released in 2005.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-Class |
| Generation | S-Class Long (V221, facelift 2009) |
| Type | S 450 V8 (340 Hp) 4MATIC G-TRONIC |
| Start of production | 2009 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 16.3-16.4 l/100 km (14.4 – 14.3 US mpg, 17.3 – 17.2 UK mpg, 6.1 – 6.1 km/l) |
| Fuel consumption (extra urban) | 7.9-8 l/100 km (29.8 – 29.4 US mpg, 35.8 – 35.3 UK mpg, 12.7 – 12.5 km/l) |
| Fuel consumption (combined) | 11-11.1 l/100 km (21.4 – 21.2 US mpg, 25.7 – 25.4 UK mpg, 9.1 – 9 km/l) |
| CO2 emissions | 256-258 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.9 sec |
| Acceleration 0 – 62 mph | 5.9 sec |
| Acceleration 0 – 60 mph | 5.6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Weight-to-power ratio | 5.9 kg/Hp, 170 Hp/tonne |
| Weight-to-torque ratio | 4.3 kg/Nm, 230 Nm/tonne |
| Power | 340 Hp @ 6000 rpm |
| Power per litre | 72.9 Hp/l |
| Torque | 460 Nm @ 2700-5000 rpm (339.28 lb.-ft. @ 2700-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 273.924 |
| Engine displacement | 4663 cm3 (284.55 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Kerb Weight | 2000 kg (4409.25 lbs.) |
| Max. weight | 2660 kg (5864.3 lbs.) |
| Max load | 660 kg (1455.05 lbs.) |
| Trunk (boot) space – minimum | 560 l (19.78 cu. ft.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Length | 5226 mm (205.75 in.) |
| Width | 1871 mm (73.66 in.) |
| Width including mirrors | 2120 mm (83.46 in.) |
| Height | 1479 mm (58.23 in.) |
| Wheelbase | 3165 mm (124.61 in.) |
| Front track | 1600 mm (62.99 in.) |
| Rear (Back) track | 1606 mm (63.23 in.) |
| Front overhang | 888 mm (34.96 in.) |
| Rear overhang | 1173 mm (46.18 in.) |
| Minimum turning circle | 12.2 m (40.03 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 7 |
| Gearbox type | Automatic transmission G-TRONIC |
| Front brakes | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 255/45 R18 |
| Wheel rims size | 18 |
Powertrain & Engine Architecture
The S 450 4MATIC utilized the M273.924 engine, a 4.7-liter naturally aspirated V8. This engine featured a three-valve per cylinder design (two intake, one exhaust) and a multi-point fuel injection system. The M273 engine family was known for its smooth operation and relatively high specific output. The engine’s architecture was a 90-degree V-angle, contributing to its balance and refinement. The 7G-TRONIC transmission, a seven-speed automatic, was a key component of the drivetrain. It offered smooth shifts and a wide range of gear ratios, contributing to both performance and fuel efficiency. The 4MATIC system employed a multi-plate clutch to distribute torque between the front and rear axles, providing enhanced traction in various conditions. The transmission was programmed for a balance of comfort and responsiveness, prioritizing smooth shifts over aggressive downchanges unless in Sport mode.
Driving Characteristics
The S 450 4MATIC offered a refined and comfortable driving experience. While not as overtly sporty as the S 550 or AMG models, the 340 horsepower and 339 lb-ft of torque provided ample power for effortless cruising and confident acceleration. The 0-60 mph time of around 5.6 seconds was respectable for a large luxury sedan. The 7G-TRONIC transmission contributed to smooth and seamless gear changes, and the 4MATIC system provided reassuring stability, particularly in inclement weather. Compared to the S 350, the S 450 offered a noticeable performance upgrade, while remaining more fuel-efficient and less expensive than the higher-output models. The gear ratios were tuned for relaxed highway cruising, with a focus on minimizing engine revs at typical speeds.
Equipment & Trim Levels
The S 450 4MATIC came standard with a comprehensive array of luxury features, including leather upholstery, wood trim, dual-zone automatic climate control, a premium sound system, and a power-adjustable driver and passenger seats with memory function. Standard safety features included a full suite of airbags, anti-lock brakes, electronic stability control, and traction control. Optional extras included features like a rear-seat entertainment system, massaging seats, a panoramic sunroof, and advanced driver-assistance systems such as Distronic Plus adaptive cruise control and lane-keeping assist. The interior design was characterized by its elegant simplicity and high-quality materials.
Chassis & Braking
The V221 S-Class featured an independent suspension system all around, with air suspension as standard equipment. This provided a remarkably smooth and comfortable ride, absorbing bumps and imperfections in the road with ease. The S 450 4MATIC utilized disc brakes on all four wheels, providing ample stopping power. The anti-lock braking system (ABS) and electronic stability control (ESC) worked in conjunction to enhance braking performance and maintain vehicle control in challenging situations. The suspension was tuned to prioritize comfort, but also offered good body control and handling characteristics.
Market Reception & Comparison
The S 450 4MATIC was generally well-received by automotive critics. It was praised for its comfortable ride, refined engine, and luxurious interior. Some reviewers noted that it lacked the outright performance of the S 550 and AMG models, but considered it a compelling value proposition for buyers seeking a balance of luxury, performance, and all-weather capability. Fuel economy was considered average for a vehicle in this class, and reliability was generally good, although the complex electronics of the V221 S-Class could be prone to occasional issues. Compared to the S 350, the S 450 offered a significant performance boost, while the S 550 provided even more power but at a higher price point.
Legacy
The M273 engine, while generally reliable, can require maintenance on its valve cover gaskets and oil cooler lines as it ages. The 7G-TRONIC transmission is also known to be durable, but may require fluid changes and occasional valve body servicing. Today, the S 450 4MATIC represents a relatively affordable entry point into the world of high-end Mercedes-Benz luxury. Well-maintained examples are still sought after by enthusiasts who appreciate their combination of comfort, performance, and classic styling. The V221 S-Class, including the S 450 4MATIC, remains a benchmark for luxury sedans, and its advanced technology and refined driving experience continue to impress.
