The Mercedes-Benz S 450, part of the V221 S-Class Long wheelbase facelift introduced in 2009, represented a compelling blend of luxury, performance, and technology within the flagship Mercedes-Benz range. Produced through 2010, this variant occupied a significant position in the lineup, offering a step up in power and refinement from the S 350 while remaining more accessible than the range-topping S 550 and S 63 AMG models. The “Long” designation indicated an extended wheelbase, prioritizing rear passenger comfort – a key feature for the S-Class’s target demographic, particularly in markets like China and Europe where chauffeur-driven luxury was highly valued. This model aimed to deliver a sophisticated driving experience with a focus on smooth power delivery and advanced features.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V221, facelift 2009) |
| Type (Engine) | S 450 V8 (340 Hp) 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) | 16.0-16.3 l/100 km (14.7 – 14.4 US mpg, 17.7 – 17.3 UK mpg, 6.3 – 6.1 km/l) |
| Fuel consumption (extra urban) | 7.8-8.0 l/100 km (30.2 – 29.4 US mpg, 36.2 – 35.3 UK mpg, 12.8 – 12.5 km/l) |
| Fuel consumption (combined) | 10.7-11 l/100 km (22 – 21.4 US mpg, 26.4 – 25.7 UK mpg, 9.3 – 9.1 km/l) |
| CO2 emissions | 251-257 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 | 5.7 kg/Hp, 175.3 Hp/tonne |
| Weight-to-torque ratio | 4.2 kg/Nm, 237.1 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 273.922 |
| 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 | 1940 kg (4276.97 lbs.) |
| Max. weight | 2595 kg (5721 lbs.) |
| Max load | 655 kg (1444.03 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.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 7 gears, 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 |
INTRODUCTION
The S 450, launched as part of the V221 facelift in 2009, was a crucial variant in the Mercedes-Benz S-Class lineup. The V221 generation (2005-2013) represented a significant leap forward in luxury and technology for the brand. The 2009 facelift brought revised styling, updated safety features, and more efficient engine options. The S 450 specifically aimed to bridge the gap between the entry-level S 350 and the more powerful S 550, offering a compelling combination of performance and value. Its extended wheelbase provided enhanced rear passenger space, catering to the demands of discerning buyers who prioritized comfort and prestige.
Powertrain & Engine Architecture
At the heart of the S 450 lay the M273.922 4.7-liter naturally aspirated V8 engine. This engine, a cornerstone of Mercedes-Benz’s powertrain strategy during this period, was known for its smooth operation and robust construction. It featured a three-valve-per-cylinder design (two intake, one exhaust) and a multi-port fuel injection system. The engine produced 340 horsepower at 6,000 rpm and 460 Nm (339.28 lb-ft) of torque between 2,700 and 5,000 rpm. The engine’s architecture was a 90-degree V configuration, contributing to its inherent balance and refinement. Paired with the engine was the 7G-TRONIC seven-speed automatic transmission, renowned for its smooth and responsive shifts. This transmission offered a wide range of gear ratios, optimizing both fuel efficiency and performance. The 7G-TRONIC also featured a manual shift mode, allowing drivers to take greater control over gear selection.
Driving Characteristics
The S 450’s driving experience was characterized by its effortless power delivery and refined ride quality. While not as overtly sporty as the S 550 or AMG variants, the 4.7-liter V8 provided ample acceleration, achieving 0-60 mph in approximately 5.6 seconds. The 7G-TRONIC transmission played a crucial role in maximizing the engine’s output, providing seamless gear changes and keeping the engine within its optimal power band. Compared to the S 350, the S 450 offered a noticeable improvement in responsiveness and overall performance. The longer wheelbase contributed to a more stable and comfortable ride, particularly on highway journeys. The steering was precise and well-weighted, providing a confident feel behind the wheel. However, the S 450’s weight (approximately 4,277 lbs) meant it wasn’t as agile as some of its competitors.
Equipment & Trim Levels
The S 450 came standard with a comprehensive array of luxury features, befitting its flagship status. These included leather upholstery, wood trim, a premium sound system, dual-zone automatic climate control, and power-adjustable front seats with memory function. Standard safety features included ABS, traction control, stability control, and a suite of airbags. Optional extras included a rear-seat entertainment system, massaging seats, a panoramic sunroof, and advanced driver-assistance systems such as Distronic Plus (adaptive cruise control) and Pre-Safe brake assist. The interior design was elegant and understated, with a focus on high-quality materials and meticulous craftsmanship. Trim levels were relatively limited, with most customization options available through individual selections rather than distinct packages.
Chassis & Braking
The S 450 utilized a fully independent suspension system, featuring multi-link setups at both the front and rear. This suspension design provided a comfortable and controlled ride, effectively absorbing bumps and minimizing body roll. The standard braking system consisted of disc brakes on all four wheels, coupled with ABS and electronic brake-force distribution. The S-Class also featured Airmatic suspension as standard, which used air springs to provide a smoother, more adjustable ride. Stabilizer bars were fitted to both the front and rear axles to further enhance handling stability. The long wheelbase contributed to the car’s inherent stability, while the relatively heavy weight demanded a robust braking system to ensure confident stopping power.
Market Reception & Comparison
The S 450 was generally well-received by automotive critics, who praised its smooth engine, comfortable ride, and luxurious interior. It was seen as a strong contender in the luxury sedan segment, offering a compelling alternative to rivals such as the BMW 7 Series and Audi A8. Compared to the S 350, the S 450 offered a significant performance upgrade, while remaining more affordable than the S 550. Fuel economy was reasonable for a vehicle of its size and class, although it wasn’t a primary selling point. Reliability was generally good, although some owners reported minor issues with electronic components. The S 450’s extended wheelbase and focus on rear passenger comfort made it particularly popular in markets where chauffeur-driven transportation was common.
Legacy
The Mercedes-Benz S 450 (V221 facelift) remains a desirable used car today, appreciated for its blend of luxury, performance, and reliability. The M273 engine, while not the most fuel-efficient, is known for its durability and relatively straightforward maintenance. However, potential buyers should be aware of the potential for issues with the air suspension system and electronic components. The S 450 represents a high point in Mercedes-Benz engineering, offering a refined and comfortable driving experience that continues to appeal to discerning buyers. Its long-term value is supported by the S-Class’s enduring reputation for quality and prestige.
