The Mercedes-Benz CLS 400 V6, produced from July 2014 to April 2016, represents a significant iteration of the C218 facelift generation of the CLS-Class. Positioned as a mid-range offering within the CLS lineup, it aimed to bridge the gap between the entry-level CLS 350 and the performance-oriented CLS 550 models. This four-door coupe blended luxury, performance, and technology, appealing to buyers seeking a stylish and sophisticated grand tourer. The CLS, originally introduced in 2004, pioneered the four-door coupe segment, and the C218 facelift refined the design and enhanced the driving experience. The CLS 400 V6 specifically targeted customers desiring a balance of power and efficiency, offering a compelling alternative to traditional sedans.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLS |
| Generation | CLS coupe (C218 facelift, 2014) |
| Type | CLS 400 V6 (333 Hp) 7G-TRONIC PLUS |
| Start of production | July, 2014 |
| End of production | April, 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption (urban) | 9.6-9.7 l/100 km (24.5 – 24.2 US mpg) |
| Fuel consumption (extra urban) | 5.6-5.7 l/100 km (42 – 41.3 US mpg) |
| Fuel consumption (combined) | 7.1-7.2 l/100 km (33.1 – 32.7 US mpg) |
| CO2 emissions | 164-167 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.3 sec |
| Acceleration 0 – 62 mph | 5.3 sec |
| Acceleration 0 – 60 mph | 5 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.1 kg/Hp |
| Weight-to-torque ratio | 3.5 kg/Nm |
| Power | 333 Hp @ 5250-6000 rpm |
| Torque | 480 Nm @ 1200-4000 rpm (354.03 lb.-ft. @ 1200-4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 276.850 |
| Engine displacement | 3498 cm3 (213.46 cu. in.) |
| Number of cylinders | 6 |
| 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 | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant capacity | 9.6 l (10.14 US qt | 8.45 UK qt) |
| Kerb Weight | 1700 kg (3747.86 lbs.) |
| Max. weight | 2260 kg (4982.45 lbs.) |
| Max load | 560 kg (1234.59 lbs.) |
| Trunk (boot) space (minimum) | 520 l (18.36 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal | 12.98 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.) |
| Drag coefficient (Cd) | 0.29 |
| Minimum turning circle | 11.18 m (36.68 ft.) |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Number of gears | 7 |
| Gearbox type | Automatic transmission G-TRONIC PLUS |
Powertrain & Engine Architecture
The CLS 400 V6 is powered by the M276.850 3.5-liter V6 engine. This engine is a naturally aspirated powerplant featuring direct fuel injection and twin turbochargers. The engine produces 333 horsepower at 5250-6000 rpm and 480 Nm (354 lb-ft) of torque between 1200-4000 rpm. The engine utilizes a DOHC (Double Overhead Camshaft) valvetrain with four valves per cylinder. The M276 engine family is known for its smooth operation and relatively high efficiency. The engine is paired with Mercedes-Benz’s 7G-TRONIC PLUS seven-speed automatic transmission. This transmission is renowned for its smooth and quick shifts, contributing to both performance and fuel economy. The 7G-TRONIC PLUS features a torque converter lock-up clutch that engages at higher speeds to improve efficiency.
Driving Characteristics
The CLS 400 V6 offers a refined and comfortable driving experience. While not as overtly sporty as the CLS 550, it provides ample power for both highway cruising and spirited driving. The 7G-TRONIC PLUS transmission is well-tuned, offering seamless gear changes and responsive acceleration. The gear ratios are optimized for both fuel efficiency and performance, with a relatively short final drive providing brisk acceleration. Compared to the CLS 350, the V6 engine delivers noticeably more power and torque, resulting in quicker acceleration and improved passing performance. The CLS 400 V6 feels planted and stable on the road, thanks to its well-tuned suspension and relatively low center of gravity.
Equipment & Trim Levels
The CLS 400 V6 came standard with a comprehensive list of features, including leather upholstery, power-adjustable front seats with memory function, dual-zone automatic climate control, a premium sound system, and a navigation system. Standard safety features included ABS, traction control, stability control, and a suite of airbags. Optional extras included a panoramic sunroof, a rear-view camera, parking sensors, adaptive cruise control, and a more advanced multimedia system. Interior trim options included various wood veneers and aluminum accents. The CLS 400 V6 typically featured a more luxurious interior than the base CLS 350, with higher-quality materials and more standard features.
Chassis & Braking
The CLS 400 V6 utilizes a four-wheel independent suspension system, with coil springs and multi-link setups at both the front and rear. Many examples were equipped with the optional AIRMATIC air suspension, which provides adjustable ride height and damping for enhanced comfort and handling. The braking system consists of ventilated discs at all four corners, providing ample stopping power. ABS (Anti-lock Braking System) and Electronic Stability Program (ESP) are standard features, enhancing safety and control. The steering system is a speed-sensitive power steering rack and pinion, providing precise and responsive steering feel.
Market Reception & Comparison
The CLS 400 V6 was generally well-received by automotive critics. It was praised for its stylish design, luxurious interior, and refined driving experience. The engine was considered a good balance of power and efficiency, and the 7G-TRONIC PLUS transmission was lauded for its smoothness and responsiveness. Compared to the CLS 350, the 400 V6 offered a significant performance upgrade, while remaining more affordable than the range-topping CLS 550. Fuel economy was competitive for its class, and reliability was generally good. However, some critics noted that the CLS 400 V6 lacked the outright sportiness of some of its rivals.
Legacy
The M276 engine family, including the version used in the CLS 400 V6, has proven to be relatively reliable over the long term. While some maintenance items, such as timing chain tensioners, may require attention at higher mileage, the engine is generally considered durable and well-engineered. The 7G-TRONIC PLUS transmission is also known for its reliability, provided it is properly maintained. Today, the CLS 400 V6 represents a compelling value on the used car market, offering a luxurious and stylish grand touring experience at a relatively affordable price. Its blend of performance, comfort, and technology continues to appeal to buyers seeking a sophisticated and distinctive coupe.
