The Mercedes-Benz S-Class Long (V221) S 450 4MATIC, produced from 2006 to 2009, represented a significant iteration of the flagship S-Class sedan. Positioned as a mid-range offering within the extended-wheelbase V221 generation, the S 450 4MATIC bridged the gap between the entry-level S 350 and the more powerful S 500 and S 600 models. This variant was primarily aimed at buyers seeking a luxurious and technologically advanced vehicle with all-wheel drive capability, offering a balance of performance and refinement. The “Long” designation indicates an extended wheelbase, providing increased rear passenger legroom – a particularly desirable feature in markets like China and other regions where chauffeur-driven luxury is prevalent.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-Class |
| Generation | S-Class Long (V221) |
| Type | S 450 (340 Hp) 4MATIC 7G-TRONIC |
| Start of production | 2006 |
| End of production | 2009 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 17-17.2 l/100 km (13.8 – 13.7 US mpg, 16.6 – 16.4 UK mpg, 5.9 – 5.8 km/l) |
| Fuel consumption (extra urban) | 8.6-8.8 l/100 km (27.4 – 26.7 US mpg, 32.8 – 32.1 UK mpg, 11.6 – 11.4 km/l) |
| Fuel consumption (combined) | 11.7-11.9 l/100 km (20.1 – 19.8 US mpg, 24.1 – 23.7 UK mpg, 8.5 – 8.4 km/l) |
| CO2 emissions | 279-284 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 | 5.8 kg/Hp, 171.7 Hp/tonne |
| Weight-to-torque ratio | 4.3 kg/Nm, 232.3 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 |
| Cylinder Bore | 92.9 mm (3.66 in.) |
| Piston Stroke | 86 mm (3.39 in.) |
| 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 | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Kerb Weight | 1980 kg (4365.15 lbs.) |
| Max. weight | 2640 kg (5820.2 lbs.) |
| Max load | 660 kg (1455.05 lbs.) |
| Trunk (boot) space – maximum | 560 l (19.78 cu. ft.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Length | 5209 mm (205.08 in.) |
| Width | 1872 mm (73.7 in.) |
| Width including mirrors | 2115 mm (83.27 in.) |
| Height | 1473 mm (57.99 in.) |
| Wheelbase | 3165 mm (124.61 in.) |
| Front track | 1604 mm (63.15 in.) |
| Rear (Back) track | 1606 mm (63.23 in.) |
| Front overhang | 871 mm (34.29 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 suspension | Air suspension |
| Rear suspension | Air suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 235/55 R17 |
| Wheel rims size | 17 |
Powertrain & Engine Architecture
The S 450 4MATIC was powered by the M273.924 engine, a 4.7-liter naturally aspirated V8. This engine was a cornerstone of Mercedes-Benz’s powertrain lineup during the mid-2000s, 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 6000 rpm and 460 Nm (339.28 lb-ft) of torque between 2700 and 5000 rpm. The engine’s architecture was designed for refinement and durability, rather than outright performance, prioritizing a comfortable driving experience. Paired with the engine was the 7G-TRONIC seven-speed automatic transmission, a sophisticated unit that offered smooth and precise gear changes. The 4MATIC all-wheel-drive system distributed power to all four wheels, enhancing traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The S 450 4MATIC offered a composed and refined driving experience. While not as overtly sporty as some of its rivals, or even the higher-powered S-Class variants, it provided ample power for effortless cruising and confident overtaking. The 7G-TRONIC transmission contributed to a seamless power delivery, and the all-wheel-drive system instilled a sense of security. Compared to the S 350, the S 450 offered a noticeable performance upgrade, with quicker acceleration (0-60 mph in approximately 5.6 seconds). However, it lacked the outright punch of the S 500, which featured a larger displacement V8. The gear ratios were tuned for comfort and fuel efficiency, rather than aggressive acceleration.
Equipment & Trim Levels
The S 450 4MATIC came standard with a comprehensive array of luxury features, befitting its flagship status. These included leather upholstery, wood trim, dual-zone automatic climate control, a premium sound system, 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 panoramic sunroof, rear seat entertainment system, massaging seats, and advanced parking assist features. The interior design was characterized by its elegant simplicity and high-quality materials. Trim levels were relatively limited, with most customization options available through individual selections rather than distinct packages.
Chassis & Braking
The V221 S-Class featured an advanced chassis design, incorporating an air suspension system on all four corners. This system provided a remarkably smooth and comfortable ride, automatically adjusting the suspension damping to suit road conditions. The S 450 4MATIC was equipped with ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) and electronic stability control were standard features, enhancing safety and control. The suspension was tuned to prioritize ride comfort over sporty handling, although it still offered a secure and predictable driving experience.
Market Reception & Comparison
The S 450 4MATIC was generally well-received by automotive critics, who praised its luxurious interior, comfortable ride, and refined powertrain. However, some reviewers noted that it lacked the dynamic flair of some of its European competitors. Fuel economy was a common criticism, with the V8 engine consuming a significant amount of fuel, particularly in urban driving. Compared to the S 350, the S 450 offered a worthwhile performance upgrade, but at a higher price point. Compared to the S 500, it represented a more affordable option, albeit with less power. Reliability was generally good, although the complex electronic systems could be prone to occasional issues.
Legacy
The M273 engine, found in the S 450 4MATIC, has proven to be a relatively durable and reliable powertrain when properly maintained. However, like all complex engines, it is susceptible to certain issues, such as oil leaks and timing chain wear, particularly as mileage increases. The 7G-TRONIC transmission is also generally reliable, but requires regular fluid changes to ensure smooth operation. In the used car market, the V221 S-Class, including the S 450 4MATIC, remains a desirable option for buyers seeking a luxurious and technologically advanced sedan at a relatively affordable price. Its combination of comfort, refinement, and all-wheel-drive capability continues to appeal to a wide range of buyers.
