The Mercedes-Benz S-Class Long (V221) S 450, 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 aimed to balance luxury, performance, and technology. The “Long” designation indicates an extended wheelbase, providing increased rear passenger legroom – a key feature for markets where chauffeur-driven travel was common. This variant was primarily sold in markets outside of North America, where the longer wheelbase S-Class was standard. It served as a stepping stone between the entry-level S 350 and the more powerful S 500 and S 600 models.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V221) |
| Type (Engine) | S 450 (340 Hp) 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) | 16.6-16.8 l/100 km (14.2 – 14 US mpg, 17 – 16.8 UK mpg, 6 – 6 km/l) |
| Fuel consumption (extra urban) | 8.2-8.4 l/100 km (28.7 – 28 US mpg, 34.4 – 33.6 UK mpg, 12.2 – 11.9 km/l) |
| Fuel consumption (combined) | 11.3-11.5 l/100 km (20.8 – 20.5 US mpg, 25 – 24.6 UK mpg, 8.8 – 8.7 km/l) |
| CO2 emissions | 269-274 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 | 5.6 kg/Hp, 178 Hp/tonne |
| Weight-to-torque ratio | 4.2 kg/Nm, 240.8 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 |
| 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 | 1910 kg (4210.83 lbs.) |
| Max. weight | 2565 kg (5654.86 lbs.) |
| Max load | 655 kg (1444.03 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.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 7 gears, 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 was powered by the M273.922 4.7-liter naturally aspirated V8 engine. This engine was a cornerstone of Mercedes-Benz’s engine lineup during the mid-2000s, known for its smooth operation and relatively high output. 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 block was constructed from aluminum, contributing to weight savings. Paired with the engine was the 7G-TRONIC seven-speed automatic transmission, a significant advancement over previous five-speed automatics. The 7G-TRONIC offered smoother shifts, improved fuel efficiency, and a wider range of gear ratios. This transmission was known for its adaptability, offering selectable driving modes to suit different driving conditions.
Driving Characteristics
The S 450, with its 340 hp and 7G-TRONIC transmission, delivered a refined and comfortable driving experience. Acceleration from 0 to 60 mph was achieved in approximately 5.6 seconds, making it reasonably quick for a large luxury sedan. However, it wasn’t designed for outright performance like the S 500 or AMG variants. The 7G-TRONIC transmission was programmed for smooth, almost imperceptible gear changes, prioritizing comfort over aggressive shifting. The gear ratios were optimized for both highway cruising and relaxed city driving. Compared to the S 350, the S 450 offered noticeably more power and a more effortless feel, particularly when overtaking or merging onto highways. The V8 engine provided a more satisfying exhaust note and a broader torque curve than the smaller V6 in the S 350.
Equipment & Trim Levels
The S 450 Long came standard with a comprehensive array of luxury features. These included leather upholstery, wood trim, 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 were plentiful, including a panoramic sunroof, rear seat entertainment system, massaging seats, and advanced parking assist features. Interior color schemes were customizable, allowing buyers to personalize their vehicles. The extended wheelbase provided significantly more rear legroom, making it a popular choice for those who frequently traveled with passengers in the back.
Chassis & Braking
The V221 S-Class featured an advanced chassis design incorporating an air suspension system on both the front and rear axles. This air suspension provided a remarkably smooth and comfortable ride, automatically adjusting to road conditions and vehicle load. The S 450 utilized ventilated disc brakes on all four wheels, providing ample stopping power. The anti-lock braking system (ABS) and electronic stability program (ESP) further enhanced safety. The suspension was tuned to prioritize ride comfort, but still offered reasonably controlled handling. The long wheelbase contributed to increased stability at highway speeds.
Market Reception & Comparison
The S 450 Long was generally well-received by automotive critics. It was praised for its comfortable ride, refined interior, and powerful engine. However, some critics noted that it didn’t offer the same level of performance as the higher-end S 500 or AMG models. Fuel economy, while acceptable for a V8-powered luxury sedan, was not a strong point, averaging around 20-25 mpg in combined driving. Compared to the S 350, the S 450 offered a significant upgrade in performance and refinement, justifying the higher price tag for many buyers. Against competitors like the BMW 7 Series and Audi A8, the S 450 was considered a strong contender, offering a unique blend of luxury, technology, and comfort.
Legacy
The M273 engine, found in the S 450, has proven to be relatively reliable, although preventative maintenance is crucial. Common issues include oil leaks from the valve cover gaskets and potential problems with the balance shaft. The 7G-TRONIC transmission is also generally reliable, but requires regular fluid changes to ensure smooth operation. Today, the V221 S-Class, including the S 450, represents a good value on the used car market. It offers a significant amount of luxury and technology for the price. However, potential buyers should be aware of the potential maintenance costs associated with a high-end Mercedes-Benz of this era. The S 450 Long remains a desirable option for those seeking a comfortable and spacious luxury sedan with a proven powertrain.
