The Mercedes-Benz CLS 550, part of the C219 facelift generation produced from 2008 to 2010, represented a significant offering in the burgeoning four-door coupe segment. Building upon the original CLS’s innovative design, the facelift brought revised styling, enhanced technology, and refined powertrain options. The CLS 550, equipped with the naturally aspirated 5.5-liter V8 engine and the 7G-TRONIC seven-speed automatic transmission, occupied the premium position within the C219 lineup, offering a blend of performance, luxury, and sophisticated technology. It was primarily marketed towards buyers in North America, Europe, and Asia who desired a stylish and powerful alternative to traditional sedans.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLS |
| Generation | CLS coupe (C219, facelift 2008) |
| Type (Engine) | CLS 550 V8 (382 Hp) 7G-TRONIC |
| Start of production | 2008 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption (urban) | 16.8 l/100 km (14 US mpg, 16.8 UK mpg, 6 km/l) |
| Fuel consumption (extra urban) | 11.2 l/100 km (21 US mpg, 25.2 UK mpg, 8.9 km/l) |
| Fuel consumption (combined) | 14.7 l/100 km (16 US mpg, 19.2 UK mpg, 6.8 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 60 mph | 5.4 sec |
| Weight-to-power ratio | 4.8 kg/Hp, 209.5 Hp/tonne |
| Weight-to-torque ratio | 3.4 kg/Nm, 290.7 Nm/tonne |
| Power | 382 Hp @ 6000 rpm |
| Power per litre | 70 Hp/l |
| Torque | 530 Nm @ 2800-4800 rpm (390.91 lb.-ft. @ 2800-4800 rpm) |
| Maximum engine speed | 6500 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 273.960 |
| Engine displacement | 5461 cm3 (333.25 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 98 mm (3.86 in.) |
| Piston Stroke | 90.5 mm (3.56 in.) |
| Compression ratio | 10.7:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant | 11.3 l (11.94 US qt | 9.94 UK qt) |
| Kerb Weight | 1823 kg (4019.03 lbs.) |
| Trunk (boot) space – minimum | 450 l (15.89 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Length | 4920 mm (193.7 in.) |
| Width | 1872 mm (73.7 in.) |
| Width including mirrors | 2107 mm (82.95 in.) |
| Height | 1414 mm (55.67 in.) |
| Wheelbase | 2854 mm (112.36 in.) |
| Front track | 1587 mm (62.48 in.) |
| Rear (Back) track | 1570 mm (61.81 in.) |
| Minimum turning circle (turning diameter) | 11.2 m (36.75 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 7 gears, automatic transmission G-TRONIC |
| Front suspension | Independent multi-link suspension, Transverse stabilizer, Air suspension |
| Rear suspension | Independent multi-link suspension, Air suspension, Transverse stabilizer |
| Front brakes | Ventilated discs, 330 mm |
| Rear brakes | Ventilated discs, 300 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | Front wheel tires: 245/40 R18 Rear wheel tires: 275/35 R18 |
| Wheel rims size | Front wheel rims: 8.5J x 18 Rear wheel rims: 9.5J x 18 |
Powertrain & Engine Architecture
The heart of the CLS 550 was the M273.960 5.5-liter naturally aspirated V8 engine. This engine, a cornerstone of Mercedes-Benz’s performance lineup during the late 2000s, featured a three-valve per cylinder design (two intake, one exhaust) and a relatively high 10.7:1 compression ratio. Fuel delivery was handled by a multi-port fuel injection system, optimized for smooth power delivery and efficiency. The engine produced 382 horsepower at 6000 rpm and 530 Nm (390.91 lb-ft) of torque between 2800 and 4800 rpm. The 7G-TRONIC seven-speed automatic transmission, a sophisticated unit for its time, was specifically tuned to complement the V8’s characteristics. It offered smooth, quick shifts and a wide range of gear ratios, contributing to both performance and fuel economy. The transmission featured a torque converter lock-up clutch to improve efficiency at cruising speeds.
Driving Characteristics
The CLS 550 offered a refined and powerful driving experience. The 5.5-liter V8 provided ample acceleration, with a 0-60 mph time of 5.4 seconds. While not as overtly sporty as some of its competitors, the CLS 550 prioritized comfort and effortless cruising. The 7G-TRONIC transmission contributed to this, providing seamless gear changes and keeping the engine in its optimal power band. Compared to the CLS 350, which used a smaller V6 engine, the 550 offered significantly more power and torque, resulting in a more confident and engaging driving experience. It differed from the later CLS 63 AMG models, which featured a more powerful and aggressively tuned V8, focusing on outright performance rather than the CLS 550’s balance of luxury and power.
Equipment & Trim Levels
The CLS 550 came standard with a comprehensive list of luxury features, including 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 panoramic sunroof, upgraded leather, a rear-seat entertainment system, and advanced driver-assistance systems like Distronic adaptive cruise control and Parktronic parking assist. The interior design was characterized by its elegant and modern aesthetic, with a focus on high-quality materials and craftsmanship.
Chassis & Braking
The CLS 550 featured an independent multi-link suspension at all four corners, providing a comfortable and controlled ride. Air suspension was standard, allowing for adjustable ride height and damping. This system further enhanced ride quality and provided a more stable platform for handling. Braking duties were handled by ventilated discs on all four wheels, providing ample stopping power. The front discs measured 330mm, while the rear discs were 300mm. ABS (Anti-lock Braking System) was standard, ensuring safe and controlled braking in various conditions.
Market Reception & Comparison
The CLS 550 was generally well-received by automotive critics, who praised its stylish design, luxurious interior, and powerful engine. However, its fuel economy was often cited as a drawback, particularly compared to some of its more fuel-efficient competitors. Compared to the CLS 350, the 550 offered a significant performance upgrade, but at a higher price point. The CLS 550’s combination of luxury, performance, and technology positioned it as a compelling alternative to traditional luxury sedans and coupes.
Legacy
The M273 engine, while generally reliable, is known to require preventative maintenance, particularly regarding the valve cover gaskets and oil cooler lines, which can become brittle with age. The 7G-TRONIC transmission is also generally durable, but regular fluid changes are crucial for maintaining its smooth operation. Today, the CLS 550 represents a well-equipped and stylish grand tourer from the late 2000s. Well-maintained examples are sought after by enthusiasts who appreciate its blend of luxury, performance, and distinctive design. Its continued presence in the used car market demonstrates its enduring appeal and the quality of its engineering.
