The Mercedes-Benz CLS 350 BlueTEC, produced between March 2013 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 catered to buyers seeking a sophisticated four-door coupe experience with the added benefit of a diesel powertrain. This variant distinguished itself from the more performance-oriented CLS 550 models and the later, more fuel-focused CLS 220 BlueTEC, offering a balance between power and economy. The C218 CLS, overall, aimed to create a new segment – the four-door coupe – and the 350 BlueTEC played a significant role in establishing the model’s appeal in European and select international markets.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLS |
| Generation | CLS coupe (C218) |
| Type (Engine) | CLS 350 BlueTEC V6 (248 Hp) 7G-TRONIC PLUS |
| Start of production | March, 2013 |
| End of production | September, 2014 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption (urban) | 6.8 l/100 km (34.6 US mpg, 41.5 UK mpg, 14.7 km/l) |
| Fuel consumption (extra urban) | 4.9-4.7 l/100 km (48 – 50 US mpg, 57.6 – 60.1 UK mpg, 20.4 – 21.3 km/l) |
| Fuel consumption (combined) | 5.6-5.5 l/100 km (42 – 42.8 US mpg, 50.4 – 51.4 UK mpg, 17.9 – 18.2 km/l) |
| CO2 emissions | 146-144 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.6 sec |
| Acceleration 0 – 62 mph | 6.6 sec |
| Acceleration 0 – 60 mph | 6.3 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 7.4 kg/Hp, 134.4 Hp/tonne |
| Weight-to-torque ratio | 3 kg/Nm, 336 Nm/tonne |
| Power | 248 Hp @ 3600 rpm |
| Power per litre | 83 Hp/l |
| 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 |
| Compression ratio | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| 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 | 1845 kg (4067.53 lbs.) |
| Max. weight | 2330 kg (5136.77 lbs.) |
| Max load | 485 kg (1069.24 lbs.) |
| Trunk (boot) space – minimum | 520 l (18.36 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal | 12.98 UK gal) |
| Length | 4940 mm (194.49 in.) |
| Width | 1881 mm (74.06 in.) |
| Height | 1416 mm (55.75 in.) |
| Wheelbase | 2874 mm (113.15 in.) |
| Front track | 1594 mm (62.76 in.) |
| Rear (Back) track | 1626 mm (64.02 in.) |
| Minimum turning circle | 11.27 m (36.98 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 7 |
| Gearbox type | automatic transmission G-TRONIC PLUS |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/45 R17 |
| Wheel rims size | 17 |
Powertrain & Engine Architecture
The CLS 350 BlueTEC utilized the OM642.852 3.0-liter V6 diesel engine, a mainstay in the Mercedes-Benz lineup. This engine featured a robust cast iron block and aluminum cylinder heads, incorporating a sophisticated common-rail direct injection system operating at pressures up to 2,100 bar. A variable geometry turbocharger with an intercooler further enhanced performance and efficiency. The engine produced 248 horsepower at 3,600 rpm and a substantial 620 Nm (457 lb-ft) of torque between 1,600 and 2,400 rpm. This broad torque curve was a key characteristic of the engine, providing strong acceleration in real-world driving conditions. The engine also incorporated a diesel particulate filter (DPF) to meet stringent Euro 6 emission standards. Paired with the engine was the 7G-TRONIC PLUS seven-speed automatic transmission, known for its smooth and responsive shifts. This transmission featured a torque converter lock-up clutch to improve fuel efficiency at cruising speeds.
Driving Characteristics
The CLS 350 BlueTEC offered a refined and comfortable driving experience. While not as overtly sporty as the CLS 550, the diesel engine’s ample torque provided brisk acceleration, with 0-60 mph times around 6.3 seconds. The 7G-TRONIC PLUS transmission contributed to seamless gear changes, and the relatively long gear ratios prioritized fuel economy over outright performance. Compared to the manual transmission options available on other Mercedes-Benz models, the automatic offered greater convenience, particularly in urban environments. The CLS 350 BlueTEC felt more relaxed and effortless on long journeys than the higher-output variants, making it an ideal grand tourer. The rear-wheel drive configuration provided a balanced feel, although it could be less confident in slippery conditions compared to all-wheel drive models.
Equipment & Trim Levels
The CLS 350 BlueTEC came standard with a generous array of features, reflecting its positioning as a luxury vehicle. Standard equipment typically included leather upholstery, automatic climate control, a premium audio system, and a host of safety features such as ABS, ESP, and multiple airbags. Optional extras included a panoramic sunroof, upgraded leather packages, a driver assistance package (including adaptive cruise control and lane keeping assist), and various interior trim options. The dashboard layout was typical of Mercedes-Benz at the time, featuring a blend of analog gauges and a central infotainment screen. The interior ambiance was generally upscale and well-appointed, with a focus on comfort and refinement.
Chassis & Braking
The CLS 350 BlueTEC featured a sophisticated chassis designed to balance comfort and handling. The front suspension utilized McPherson struts with coil springs and an anti-roll bar, while the rear suspension employed a multi-link setup. This configuration provided a smooth and controlled ride, even on uneven surfaces. The braking system consisted of ventilated discs on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) and ESP (Electronic Stability Program) were standard features, enhancing safety and stability. The steering was a rack-and-pinion system with electric power assistance, offering precise and responsive control.
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. Compared to the CLS 550, the 350 BlueTEC offered a more economical option without sacrificing too much in terms of performance or comfort. Against the CLS 220 BlueTEC, it provided a noticeable power upgrade, making it a more engaging driving experience. Fuel economy was a strong point, with combined figures around 42-43 mpg, making it a competitive option in its class. Reliability was generally good, although, like all modern diesel vehicles, the DPF could require occasional maintenance.
Legacy
The CLS 350 BlueTEC, while not the most common variant of the C218 generation, has established a reputation as a reliable and well-rounded luxury coupe. The OM642 engine is known for its durability, and the 7G-TRONIC PLUS transmission has proven to be a robust unit. On the used car market, these models represent a good value proposition, offering a blend of luxury, performance, and fuel efficiency at a relatively affordable price point. However, potential buyers should be aware of the potential maintenance costs associated with diesel engines, particularly the DPF and fuel injection system. Overall, the CLS 350 BlueTEC remains a desirable option for those seeking a stylish and sophisticated four-door coupe.
