The Mercedes-Benz C-Class (W204) C 350 CDI BlueEFFICIENCY 4MATIC, produced from 2009 to 2011, represented a compelling blend of performance, efficiency, and luxury within the broader C-Class range. Positioned as a mid-to-upper tier offering, it catered to buyers seeking a refined diesel experience with all-wheel drive capability. This variant utilized a 3.0-liter V6 turbodiesel engine paired with a 7G-TRONIC automatic transmission and the 4MATIC all-wheel drive system, distinguishing itself from the gasoline-powered C350 and lower-displacement diesel models.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-Class |
| Generation | C-Class (W204) |
| Type | C 350 CDI BlueEFFICIENCY V6 (231 Hp) 4MATIC 7G-TRONIC |
| Start of production | 2009 |
| End of production | 2011 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 9.1-9.2 l/100 km (25.8 – 25.6 US mpg) |
| Fuel consumption (extra urban) | 5.9-6.1 l/100 km (39.9 – 38.6 US mpg) |
| Fuel consumption (combined) | 7-7.2 l/100 km (33.6 – 32.7 US mpg) |
| CO2 emissions | 185-189 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.4 sec |
| Acceleration 0 – 62 mph | 6.4 sec |
| Acceleration 0 – 60 mph | 6.1 sec |
| Maximum speed | 250 km/h (155.34 mph) – Electronically limited |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 7.3 kg/Hp |
| Weight-to-torque ratio | 3.1 kg/Nm |
| Power | 231 Hp @ 3800 rpm |
| Torque | 540 Nm @ 1600-2400 rpm (398.28 lb.-ft. @ 1600-2400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.830 |
| 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 | 17.7:1 |
| 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) |
| Kerb Weight | 1685 kg (3714.79 lbs.) |
| Max. weight | 2265 kg (4993.47 lbs.) |
| Max load | 580 kg (1278.68 lbs.) |
| Trunk (boot) space (minimum) | 475 l (16.77 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load (with brakes) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load (without brakes) | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4581 mm (180.35 in.) |
| Width | 1770 mm (69.69 in.) |
| Width including mirrors | 2009 mm (79.09 in.) |
| Height | 1447 mm (56.97 in.) |
| Wheelbase | 2760 mm (108.66 in.) |
| Front track | 1549 mm (60.98 in.) |
| Rear track | 1552 mm (61.1 in.) |
| Front overhang | 765 mm (30.12 in.) |
| Rear overhang | 1056 mm (41.57 in.) |
| Minimum turning circle | 10.84 m (35.56 ft.) |
| Drivetrain | All wheel drive (4×4) |
| Number of gears | 7 |
| Gearbox type | Automatic transmission G-TRONIC |
| Front suspension | Independent type McPherson, Transverse stabilizer |
| Rear suspension | Independent multi-link suspension, Transverse stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 225/45 R17 |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
The heart of the C 350 CDI BlueEFFICIENCY 4MATIC is the OM 642.830 3.0-liter V6 diesel engine. This engine is a robust and technologically advanced design, featuring a common rail direct injection system, a variable geometry turbocharger, and an intercooler. The common rail system, operating at extremely high pressures, allows for precise fuel metering and optimized combustion. The V6 configuration provides inherent smoothness and balance, minimizing vibrations. The engine produces 231 horsepower at 3800 rpm and a substantial 540 Nm (398 lb-ft) of torque between 1600 and 2400 rpm. This broad torque curve is a hallmark of diesel engines, providing strong pulling power across a wide range of engine speeds. The 7G-TRONIC automatic transmission, a seven-speed unit, further enhances the driving experience. Its closely spaced gear ratios allow the engine to operate within its optimal power band, maximizing both performance and fuel efficiency.
Driving Characteristics
The C 350 CDI 4MATIC delivers a refined and confident driving experience. The abundant torque allows for effortless acceleration, making overtaking maneuvers easy and safe. While not as overtly sporty as the C 350 gasoline model, the diesel offers a more relaxed and composed feel. The 7G-TRONIC transmission shifts smoothly and responsively, contributing to a seamless driving experience. The 4MATIC all-wheel drive system provides enhanced traction and stability, particularly in adverse weather conditions. Compared to the rear-wheel drive C-Class models, the 4MATIC version offers greater confidence and control. The gear ratios are tuned for a balance between performance and fuel economy, with higher gears designed for efficient cruising on the highway.
Equipment & Trim Levels
The C 350 CDI BlueEFFICIENCY 4MATIC typically came well-equipped as standard. Features included automatic climate control, a multi-function steering wheel, power-adjustable front seats, and a high-quality audio system. Leather upholstery was often standard, along with wood or aluminum trim accents. Optional extras included a navigation system, a sunroof, premium sound system, and advanced driver-assistance systems such as parking assist and lane keeping assist. The “BlueEFFICIENCY” designation indicated the inclusion of fuel-saving technologies, such as start-stop functionality and optimized aerodynamics.
Chassis & Braking
The W204 C-Class featured a sophisticated chassis design, with an independent multi-link suspension at the rear and a McPherson strut setup at the front. This configuration provides a good balance between ride comfort and handling precision. The C 350 CDI 4MATIC utilized a slightly stiffer suspension setup compared to some of the lower-powered models to cope with the increased weight and torque. Braking duties were handled by ventilated disc brakes at the front and solid discs at the rear. Anti-lock braking system (ABS) and electronic stability control (ESP) were standard features, enhancing safety and control.
Market Reception & Comparison
The C 350 CDI BlueEFFICIENCY 4MATIC was generally well-received by automotive critics. It was praised for its strong performance, excellent fuel economy, and refined driving experience. Compared to the C 350 gasoline model, the diesel offered superior fuel efficiency and torque, making it a more practical choice for long-distance driving. However, the gasoline version was often preferred by those seeking a more sporty and engaging driving experience. The C 350 CDI also compared favorably to its competitors, such as the BMW 335d and Audi A6 TDI, offering a compelling combination of luxury, performance, and efficiency.
Legacy
The OM 642 engine family, including the 3.0-liter V6 used in the C 350 CDI, has proven to be remarkably durable and reliable. With proper maintenance, these engines can easily exceed 200,000 miles. The 7G-TRONIC transmission is also generally reliable, although some units may require servicing over time. In the used car market, the W204 C 350 CDI 4MATIC remains a popular choice for buyers seeking a well-rounded and efficient luxury sedan. Its combination of performance, comfort, and all-wheel drive capability continues to appeal to a wide range of drivers. However, potential buyers should be aware of the potential maintenance costs associated with a diesel engine, such as diesel particulate filter (DPF) regeneration and injector servicing.
