The Mercedes-Benz CLS 350 V6 (306 hp) with the 7G-TRONIC PLUS automatic transmission, produced between October 2010 and September 2014, represents a compelling blend of luxury, performance, and efficiency within the C218 CLS coupe generation. Positioned as a mid-range offering in the CLS lineup, it served as a more accessible entry point into the four-door coupe segment compared to the higher-performance CLS 550 and CLS 63 AMG models. The C218 CLS, launched in 2010, aimed to redefine the coupe experience by offering the sleek styling of a traditional two-door coupe with the practicality of four doors and a spacious interior. This variant specifically targeted buyers seeking a refined driving experience with adequate power and a focus on comfort and fuel economy.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLS |
| Generation | CLS coupe (C218) |
| Type (Engine) | CLS 350 V6 (306 Hp) 7G-TRONIC PLUS |
| Start of production | October, 2010 |
| End of production | September, 2014 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption (economy) – urban (NEDC) | 9.1-9.5 l/100 km (25.8 – 24.8 US mpg, 31 – 29.7 UK mpg, 11 – 10.5 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 5.4-5.6 l/100 km (43.6 – 42 US mpg, 52.3 – 50.4 UK mpg, 18.5 – 17.9 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 6.8-7 l/100 km (34.6 – 33.6 US mpg, 41.5 – 40.4 UK mpg, 14.7 – 14.3 km/l) |
| CO2 emissions (NEDC) | 159-164 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.1 sec |
| Acceleration 0 – 62 mph | 6.1 sec |
| Acceleration 0 – 60 mph | 5.8 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 5.4 kg/Hp, 184.3 Hp/tonne |
| Weight-to-torque ratio | 4.5 kg/Nm, 222.9 Nm/tonne |
| Power | 306 Hp @ 6500 rpm |
| Power per litre | 87.5 Hp/l |
| Torque | 370 Nm @ 3500-5250 rpm (272.9 lb.-ft. @ 3500-5250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 276.952 |
| 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 | 12:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 9.6 l (10.14 US qt | 8.45 UK qt) |
| Kerb Weight | 1660 kg (3659.67 lbs.) |
| Max. weight | 2220 kg (4894.26 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 | 4940 mm (194.49 in.) |
| Width | 1881 mm (74.06 in.) |
| Width including mirrors | 2075 mm (81.69 in.) |
| Height | 1416 mm (55.75 in.) |
| Wheelbase | 2874 mm (113.15 in.) |
| Front track | 1596 mm (62.83 in.) |
| Rear (Back) track | 1626 mm (64.02 in.) |
| Front overhang | 901 mm (35.47 in.) |
| Rear overhang | 1165 mm (45.87 in.) |
| Drag coefficient (Cd) | 0.27 |
| Minimum turning circle (turning diameter) | 11.27 m (36.98 ft.) |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 7 gears, automatic transmission G-TRONIC PLUS |
Powertrain & Engine Architecture
The CLS 350 V6 utilizes Mercedes-Benz’s M276 engine family, specifically the M276.952 variant. This is a 3.5-liter naturally aspirated V6 engine featuring direct fuel injection and a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The engine produces 306 horsepower at 6500 rpm and 370 Nm (272.9 lb-ft) of torque between 3500 and 5250 rpm. The direct injection system optimizes fuel delivery for improved efficiency and performance. The 7G-TRONIC PLUS automatic transmission, a seven-speed unit, was specifically tuned to complement the engine’s characteristics, offering smooth and responsive gear changes. This transmission featured a torque converter lock-up clutch to enhance efficiency at cruising speeds. The engine is longitudinally mounted, driving the rear wheels.
Driving Characteristics
The CLS 350 V6 Automatic delivers a comfortable and refined driving experience. While not as overtly sporty as the CLS 550 or AMG models, it provides ample power for everyday driving and confident highway passing. The 7G-TRONIC PLUS transmission contributes to a smooth power delivery, although it can sometimes feel slightly hesitant during quick downshifts. Compared to the six-speed automatic found in earlier CLS models, the 7G-TRONIC PLUS offers improved fuel economy and a wider gear ratio spread. The 0-60 mph time of around 5.8 seconds is respectable for a luxury coupe of this size. The automatic transmission, while convenient, doesn’t offer the same level of driver engagement as a manual gearbox, and the gear ratios are optimized for comfort and efficiency rather than outright performance.
Equipment & Trim Levels
The CLS 350 V6 typically came standard with a generous array of features, including leather upholstery, dual-zone automatic climate control, a premium sound system, and a power-adjustable driver’s seat. Optional extras included a panoramic sunroof, heated and ventilated front seats, a rear-view camera, and advanced driver-assistance systems such as lane-keeping assist and blind-spot monitoring. Interior trim options ranged from wood veneers to aluminum accents, allowing buyers to personalize the cabin to their preferences. The standard dashboard configuration featured analog gauges with a central multi-information display.
Chassis & Braking
The CLS 350 V6 utilizes a four-wheel independent suspension system, with coil springs and multi-link setups at both the front and rear. An optional air suspension system was available, providing an even more comfortable ride and the ability to adjust the vehicle’s ride height. Braking duties are handled by ventilated discs on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard safety features. The suspension tuning prioritizes comfort and stability over aggressive handling, making it well-suited for long-distance cruising.
Market Reception & Comparison
The CLS 350 V6 was generally well-received by automotive critics, who praised its stylish design, comfortable interior, and refined driving experience. It was often seen as a more sensible alternative to the more expensive and performance-focused CLS 550 and AMG models. Fuel economy was a strong point, with combined fuel consumption figures ranging from 6.8 to 7 liters per 100 kilometers (33.6 to 34.6 US mpg). Compared to the CLS 350 CDI diesel variant, the gasoline model offered slightly less fuel economy but a more responsive engine character. Reliability has generally been good, although some owners have reported minor issues with electronic components.
Legacy
The M276 engine family, including the 3.5-liter V6 used in the CLS 350, has proven to be a relatively reliable powertrain. While preventative maintenance is crucial, these engines are generally known for their longevity. On the used car market, the C218 CLS 350 V6 represents a good value proposition, offering a luxurious and stylish coupe experience at a more affordable price point than newer models. The 7G-TRONIC PLUS transmission, while not without its quirks, has also proven to be durable with proper servicing. The CLS 350 V6 remains a desirable option for buyers seeking a sophisticated and comfortable grand tourer.
