Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLS |
| Generation | CLS coupe (C218 facelift, 2014) |
| Type (Engine) | CLS 350 BlueTEC V6 (258 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 (economy) – urban (NEDC) | 6.3-6.5 l/100 km (37.3 – 36.2 US mpg, 44.8 – 43.5 UK mpg, 15.9 – 15.4 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 4.7-5 l/100 km (50 – 47 US mpg, 60.1 – 56.5 UK mpg, 21.3 – 20 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 5.3-5.5 l/100 km (44.4 – 42.8 US mpg, 53.3 – 51.4 UK mpg, 18.9 – 18.2 km/l) |
| CO2 emissions (NEDC) | 137-142 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.5 sec |
| Acceleration 0 – 62 mph | 6.5 sec |
| Acceleration 0 – 60 mph | 6.2 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 6.9 kg/Hp, 145.8 Hp/tonne |
| Weight-to-torque ratio | 2.9 kg/Nm, 350.3 Nm/tonne |
| Power | 258 Hp @ 3600 rpm |
| Torque | 620 Nm @ 1600-2400 rpm (457.29 lb.-ft. @ 1600-2400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.852 |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 10.8 l (11.41 US qt | 9.5 UK qt) |
| Kerb Weight | 1770 kg (3902.18 lbs.) |
| Max. weight | 2330 kg (5136.77 lbs.) |
| Max load | 560 kg (1234.59 lbs.) |
| Trunk (boot) space – minimum | 475 l (16.77 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal | 12.98 UK gal) |
| AdBlue tank | 25.5 l (6.74 US gal | 5.61 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 (Back) track | 1626 mm (64.02 in.) |
| Front overhang | 898 mm (35.35 in.) |
| Rear overhang | 1165 mm (45.87 in.) |
| Minimum turning circle (turning diameter) | 11.18 m (36.68 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 | 9 gears, automatic transmission G-TRONIC |
The Mercedes-Benz CLS 350 BlueTEC, specifically the facelift model introduced in July 2014 and continuing through December 2017, 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 catered to buyers seeking a sophisticated four-door coupe experience with the added benefit of a diesel powertrain. This variant combined a 3.0-liter V6 turbodiesel engine with the advanced 9G-TRONIC nine-speed automatic transmission, offering a refined driving experience and impressive fuel economy. The C218 CLS, overall, aimed to carve out a niche between traditional sedans and two-door coupes, appealing to a customer base prioritizing style and practicality.
Powertrain & Engine Architecture
At the heart of the CLS 350 BlueTEC lies the OM 642.852 3.0-liter V6 turbodiesel engine. This engine is a sophisticated design featuring a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The engine utilizes a variable geometry turbocharger (VGT) and an intercooler to maximize power and efficiency. The V6 configuration provides inherent smoothness and balance. The engine produces 258 horsepower at 3600 rpm and a substantial 620 Nm (457 lb-ft) of torque between 1600 and 2400 rpm. This broad torque curve is a hallmark of diesel engines, providing strong acceleration in everyday driving situations. The 9G-TRONIC nine-speed automatic transmission is a crucial component of this powertrain. Its wide gear ratio spread allows the engine to operate in its most efficient range more often, contributing to improved fuel economy. The transmission features smooth and quick shifts, enhancing the overall driving experience. The inclusion of a Start & Stop system further contributes to fuel savings by automatically shutting off the engine when the vehicle is stationary.
Driving Characteristics
The CLS 350 BlueTEC 9G-TRONIC delivers a comfortable and refined driving experience. While not as overtly sporty as some of its competitors or higher-trim CLS models, it offers ample power for confident overtaking and highway cruising. The 9G-TRONIC transmission is well-tuned, providing seamless gear changes and contributing to a relaxed driving feel. The abundance of low-end torque from the diesel engine means that the car feels responsive even at lower speeds. Compared to the CLS 550 with its twin-turbo V8, the 350 BlueTec prioritizes fuel efficiency and relaxed cruising over outright performance. The gear ratios in the 9G-TRONIC are optimized for both acceleration and fuel economy, with taller gears for highway driving and shorter gears for quicker response. The rear-wheel drive configuration provides a balanced feel, although it can be less confident in slippery conditions compared to all-wheel drive variants available on other CLS models.
Equipment & Trim Levels
The CLS 350 BlueTEC typically came well-equipped with standard features including leather upholstery, dual-zone automatic climate control, a premium sound system, and a comprehensive suite of safety features. Optional extras included a panoramic sunroof, advanced driver-assistance systems (such as adaptive cruise control and lane-keeping assist), upgraded interior trim materials, and a rear-seat entertainment system. The interior design emphasized luxury and sophistication, with high-quality materials and a modern aesthetic. Trim levels varied slightly depending on the market, but generally offered packages that bundled popular options together. The standard dashboard configuration featured a central infotainment screen controlled by a rotary dial and buttons, providing a user-friendly interface.
Chassis & Braking
The CLS 350 BlueTEC utilized a sophisticated suspension system designed to balance comfort and handling. The front suspension featured a multi-link setup with coil springs, while the rear suspension employed an independent multi-link design as well. Air suspension was available as an option, providing an even more comfortable ride and the ability to adjust the ride height. 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. Stabilizer bars were fitted to both the front and rear axles to reduce body roll during cornering.
Market Reception & Comparison
The CLS 350 BlueTEC was generally well-received by automotive critics. It was praised for its refined driving experience, fuel efficiency, and luxurious interior. The diesel engine was noted for its smooth operation and ample torque. Compared to the CLS 550, the 350 BlueTEC offered a more sensible option for buyers prioritizing economy and practicality. Against competitors like the Audi A7 and BMW 6 Series Gran Coupe, the CLS 350 BlueTEC stood out with its distinctive styling and comfortable ride. Fuel economy was a key strength, consistently exceeding that of its gasoline-powered rivals. Reliability was generally good, although diesel engines can be more complex to maintain than gasoline engines, potentially leading to higher repair costs over the long term.
Legacy
The CLS 350 BlueTEC, particularly the facelift model, has established a reputation as a reliable and refined luxury coupe. On the used car market, these models represent a good value proposition, offering a high level of equipment and a comfortable driving experience at a relatively affordable price point. The OM 642 engine is known for its durability, although regular maintenance is essential to ensure long-term reliability. The 9G-TRONIC transmission has also proven to be a robust and reliable unit. As with any used vehicle, a thorough inspection by a qualified mechanic is recommended before purchase. The CLS 350 BlueTEC remains a desirable option for buyers seeking a stylish and efficient luxury coupe.
