The Mercedes-Benz CLS 550 V8 4MATIC, part of the C218 facelift generation produced from 2014 to 2017, represented the performance pinnacle of the CLS “four-door coupe” range. Positioned as the flagship model, it offered a blend of luxury, performance, and advanced technology. The C218 facelift, introduced in 2014, brought styling revisions, updated technology, and refined engine options to the CLS line, solidifying its position as a desirable grand tourer. This variant specifically combined a potent twin-turbocharged V8 engine with Mercedes-Benz’s 4MATIC all-wheel-drive system and the sophisticated 9G-TRONIC nine-speed automatic transmission.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLS |
| Generation | CLS coupe (C218 facelift, 2014) |
| Type | CLS 550 V8 (402 Hp) 4MATIC 9G-TRONIC |
| Start of production | 2014 |
| End of production | 2017 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption (urban) | 13.8 l/100 km (17 US mpg, 20.5 UK mpg) |
| Fuel consumption (extra urban) | 9.4-9.8 l/100 km (25-24 US mpg, 30.1-28.8 UK mpg) |
| Fuel consumption (combined) | 11.8 l/100 km (19.9 US mpg, 23.9 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 60 mph | 4.9 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Weight-to-power ratio | 4.8 kg/Hp, 207.6 Hp/tonne |
| Weight-to-torque ratio | 3.2 kg/Nm, 309.9 Nm/tonne |
| Power | 402 Hp @ 5000-5750 rpm |
| Power per litre | 86.2 Hp/l |
| Torque | 600 Nm @ 1600-4750 rpm (442.54 lb.-ft. @ 1600-4750 rpm) |
| Maximum engine speed | 6300 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 278.922 |
| 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 | Direct injection |
| Engine aspiration | BiTurbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant capacity | 12.3 l (13 US qt | 10.82 UK qt) |
| Kerb Weight | 1936-1985 kg (4268.15 – 4376.18 lbs.) |
| Trunk (boot) space | 520 l (18.36 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Length | 4940 mm (194.49 in.) |
| Width | 1881 mm (74.06 in.) |
| Width including mirrors | 2075 mm (81.69 in.) |
| Height | 1418 mm (55.83 in.) |
| Wheelbase | 2874 mm (113.15 in.) |
| Front track | 1596 mm (62.83 in.) |
| Rear track | 1626 mm (64.02 in.) |
| Front overhang | 902 mm (35.51 in.) |
| Rear overhang | 1165 mm (45.87 in.) |
| Minimum turning circle | 11.2 m (36.75 ft.) |
| Drivetrain Architecture | All wheel drive (4×4). ICE drives all four wheels. |
| Number of gears | 9 |
| Gearbox type | 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, 360 mm |
| Rear brakes | Ventilated discs, 320 mm |
| Front tires | 255/40 R18 |
| Rear tires | 285/35 R18 |
| Front wheel rims | 8.5J x 18 |
| Rear wheel rims | 9.5J x 18 |
INTRODUCTION
The CLS 550 V8 4MATIC, launched as part of the C218 facelift in 2014, was the top-tier offering in the CLS range. Built on the Mercedes-Benz W218 platform, the C218 aimed to blend the elegance of a coupe with the practicality of a sedan. The facelift brought a more assertive front fascia, revised interior trim, and updated technology, including the introduction of the 9G-TRONIC transmission. This model served as a luxurious and high-performance alternative to traditional sedans, appealing to buyers seeking a distinctive and sporty grand tourer. It was primarily marketed in North America, Europe, and Asia, competing with vehicles like the BMW 6 Series Gran Coupe and Audi A7.
Powertrain & Engine Architecture
At the heart of the CLS 550 4MATIC lies the M278.922 4.7-liter twin-turbocharged V8 engine. This engine, a cornerstone of Mercedes-Benz’s performance lineup during this period, utilizes direct fuel injection and a sophisticated bi-turbocharging system. The two turbochargers are positioned within the ‘V’ of the engine, minimizing exhaust routing and improving responsiveness. The engine produces 402 horsepower at 5000-5750 rpm and a substantial 600 Nm (442.54 lb-ft) of torque between 1600 and 4750 rpm. The 9G-TRONIC nine-speed automatic transmission, a key upgrade with the facelift, features a wide gear ratio spread, contributing to both improved fuel efficiency and enhanced acceleration. This transmission allows the engine to operate within its optimal power band more frequently. The transmission is paired with Mercedes-Benz’s 4MATIC all-wheel-drive system, which provides enhanced traction and stability, particularly in adverse weather conditions. The 4MATIC system typically operates with a rear-wheel bias, delivering a more engaging driving experience.
Driving Characteristics
The CLS 550 V8 4MATIC delivers a refined yet potent driving experience. The twin-turbo V8 provides strong and readily available power throughout the rev range, enabling brisk acceleration – 0 to 60 mph in approximately 4.9 seconds. The 9G-TRONIC transmission shifts smoothly and efficiently, contributing to a comfortable cruising experience. While not as overtly sporty as some dedicated performance coupes, the CLS 550 offers a confident and composed ride, thanks to its air suspension and well-tuned chassis. The 4MATIC all-wheel-drive system provides excellent grip, inspiring confidence in various driving conditions. Compared to the CLS 400 (with its smaller V6 engine) or the diesel-powered CLS 350 CDI, the 550 offers significantly more power and a more luxurious feel. The manual transmission was not offered in this configuration, focusing on the seamlessness of the 9G-TRONIC.
Equipment & Trim Levels
The CLS 550 4MATIC came standard with a comprehensive array of luxury features. Interior appointments typically included premium leather upholstery, wood trim, and a high level of fit and finish. Standard equipment included features like a multi-function steering wheel, power-adjustable front seats with memory function, dual-zone automatic climate control, and a premium sound system. Optional extras included features such as a panoramic sunroof, advanced driver-assistance systems (like Distronic Plus adaptive cruise control and lane-keeping assist), a head-up display, and upgraded interior trim options. The CLS 550 was often specified with the AMG Styling package, which added more aggressive exterior styling elements.
Chassis & Braking
The CLS 550 4MATIC features a sophisticated suspension system designed to balance comfort and handling. The standard suspension utilizes independent multi-link setups at both the front and rear, along with air suspension for a smooth and controlled ride. The air suspension allows for adjustable ride height and damping settings, further enhancing comfort and adaptability. Braking duties are handled by ventilated disc brakes at all four corners, providing ample stopping power. The front brakes measure 360mm in diameter, while the rear brakes are 320mm. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard features, enhancing safety and stability.
Market Reception & Comparison
The CLS 550 V8 4MATIC was generally well-received by automotive critics. Reviewers praised its powerful engine, luxurious interior, and refined driving experience. However, some noted that its styling was polarizing and that its size could make it challenging to maneuver in tight spaces. Compared to the CLS 400, the 550 offered a significant performance advantage but came at a higher price point. Fuel economy, while respectable for a V8-powered vehicle, was lower than that of the V6 or diesel-powered models. Reliability reports generally indicate good long-term dependability, although maintenance costs for a vehicle of this complexity can be substantial.
Legacy
The CLS 550 V8 4MATIC (C218) remains a desirable used car, appreciated for its blend of luxury, performance, and distinctive styling. The M278 engine, while complex, has proven to be relatively robust when properly maintained. The 9G-TRONIC transmission is also generally considered reliable. However, potential buyers should be aware of the potential for higher maintenance costs associated with a high-performance luxury vehicle. The C218 CLS, and particularly the 550 variant, helped to establish the four-door coupe segment and continues to be a sought-after vehicle for those seeking a unique and sophisticated grand touring experience.
