The Mercedes-Benz CLS 500 V8 (C218 facelift) represents a high-performance variant of the CLS-Class “four-door coupe,” produced from July 2014 through December 2017. Positioned as a luxury performance vehicle, it slotted into the upper echelon of the C218 generation, offering a significant step up in power and refinement compared to the CLS 400 and diesel-powered models. The facelift brought styling updates and technological enhancements to the already successful CLS formula, solidifying its position as a desirable grand tourer.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLS |
| Generation | CLS coupe (C218 facelift, 2014) |
| Type | CLS 500 V8 (408 Hp) 9G-TRONIC |
| Start of production | July, 2014 |
| End of production | December, 2017 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption (urban) | 11.7-12 l/100 km (20.1 – 19.6 US mpg) |
| Fuel consumption (extra urban) | 6.6-6.7 l/100 km (35.6 – 35.1 US mpg) |
| Fuel consumption (combined) | 8.5-8.7 l/100 km (27.7 – 27 US mpg) |
| CO2 emissions | 198-202 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.8 sec |
| Acceleration 0 – 62 mph | 4.8 sec |
| Acceleration 0 – 60 mph | 4.6 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 4.4 kg/Hp |
| Weight-to-torque ratio | 3 kg/Nm |
| Power | 408 Hp @ 5000-5750 rpm |
| Torque | 600 Nm @ 1600-4750 rpm (442.54 lb.-ft.) |
| 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 | 1815 kg (4001.39 lbs.) |
| Max. weight | 2375 kg (5235.98 lbs.) |
| Max load | 560 kg (1234.59 lbs.) |
| Trunk (boot) space (minimum) | 520 l (18.36 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Length | 4937 mm (194.37 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 | 898 mm (35.35 in.) |
| Rear overhang | 1165 mm (45.87 in.) |
| Minimum turning circle | 11.21 m (36.78 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 9 |
| Gearbox type | Automatic transmission G-TRONIC |
INTRODUCTION
The C218 Mercedes-Benz CLS, introduced in 2010, pioneered the four-door coupe segment, blending the elegance of a coupe with the practicality of a sedan. The 2014 facelift brought significant updates, including revised styling, enhanced safety features, and the introduction of the 9G-TRONIC nine-speed automatic transmission. The CLS 500 V8, powered by the M278 engine, represented the performance peak of the range, offering a luxurious and powerful driving experience. It competed with vehicles like the BMW 6 Series Gran Coupe and the Audi A7 Sportback, appealing to buyers seeking a sophisticated and sporty grand tourer.
Powertrain & Engine Architecture
At the heart of the CLS 500 V8 lies the M278.922 4.7-liter V8 engine. This engine is a marvel of modern engineering, featuring direct fuel injection, twin turbochargers, and a sophisticated valvetrain. The direct injection system precisely meters fuel into the combustion chambers, maximizing efficiency and power output. The twin-turbochargers, strategically positioned within the V of the engine, provide instant throttle response and a broad torque curve. The engine utilizes a double overhead camshaft (DOHC) design with four valves per cylinder, optimizing airflow for increased performance. The 9G-TRONIC nine-speed automatic transmission, a key upgrade with the facelift, further enhances the driving experience. This transmission offers incredibly smooth and quick shifts, contributing to improved fuel economy and acceleration. The transmission’s wide gear ratio spread allows the engine to operate in its most efficient range more often.
Driving Characteristics
The CLS 500 V8 delivers a refined yet potent driving experience. The 408 horsepower and 442 lb-ft of torque provide effortless acceleration, with a 0-60 mph time of around 4.6 seconds. The 9G-TRONIC transmission plays a crucial role in this performance, providing seamless gear changes and keeping the engine in its optimal power band. Compared to the CLS 400, which featured a smaller V6 engine, the 500 V8 offered a substantial increase in power and torque, resulting in noticeably quicker acceleration and a more engaging driving experience. While not as overtly sporty as some dedicated performance coupes, the CLS 500 V8 strikes a balance between comfort and performance, making it an excellent choice for long-distance cruising and spirited driving alike. The rear-wheel drive configuration contributes to a balanced chassis and predictable handling.
Equipment & Trim Levels
The CLS 500 V8 came standard with a comprehensive array of luxury features. Interior appointments typically included premium leather upholstery, wood trim, and a high-quality audio system. Standard equipment also included features like a power sunroof, heated and ventilated front seats, a navigation system, and a rearview camera. Optional extras included features like a premium Burmester surround sound system, a head-up display, and advanced driver-assistance systems such as adaptive cruise control and lane-keeping assist. The interior design emphasized elegance and sophistication, with a focus on high-quality materials and meticulous craftsmanship. The CLS 500 V8 generally represented the highest trim level available, offering the most luxurious and well-equipped experience within the C218 range.
Chassis & Braking
The CLS 500 V8 featured a sophisticated suspension system designed to provide both comfort and handling. The front suspension utilized an independent multi-link setup with a transverse stabilizer bar, while the rear suspension also employed an independent multi-link design with an air suspension system. The air suspension allowed for adjustable ride height and damping, providing a smooth and comfortable ride even on uneven surfaces. Braking duties were handled by ventilated discs on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) were standard features, enhancing safety and control. The suspension tuning was geared towards providing a comfortable and composed ride, rather than outright sportiness, although the car still handled confidently in corners.
Market Reception & Comparison
The CLS 500 V8 was generally well-received by automotive critics, who praised its powerful engine, luxurious interior, and refined driving experience. However, some critics noted that the car’s styling was polarizing and that its rear-wheel drive configuration could be a disadvantage in inclement weather. Compared to the CLS 400, the 500 V8 offered significantly more performance, but at a higher price point. The CLS 500 V8 also offered better fuel economy than some of its competitors with comparable power, thanks to its efficient engine and nine-speed automatic transmission. Reliability reports suggest that the M278 engine is generally robust, but regular maintenance is essential to ensure long-term durability.
Legacy
The Mercedes-Benz CLS 500 V8 (C218 facelift) remains a desirable used car today, appealing to buyers seeking a luxurious and powerful grand tourer. The M278 engine, while complex, has proven to be relatively reliable when properly maintained. Common maintenance items include regular oil changes, spark plug replacements, and inspection of the turbochargers. The 9G-TRONIC transmission is also generally reliable, but fluid changes should be performed according to the manufacturer’s recommendations. The CLS 500 V8 represents a high point in the C218 generation, offering a compelling combination of performance, luxury, and style. Its enduring appeal is a testament to its engineering excellence and timeless design.
