Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-class |
| Generation | C-class (W204, facelift 2011) |
| Type (Engine) | C 250 CDI BlueEFFICIENCY (204 Hp) |
| Start of production | 2011 |
| End of production | 2014 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 6.1-6.7 l/100 km (38.6 – 35.1 US mpg, 46.3 – 42.2 UK mpg, 16.4 – 14.9 km/l) |
| Fuel consumption (extra urban) | 4-4.5 l/100 km (58.8 – 52.3 US mpg, 70.6 – 62.8 UK mpg, 25 – 22.2 km/l) |
| Fuel consumption (combined) | 4.8-5.3 l/100 km (49 – 44.4 US mpg, 58.9 – 53.3 UK mpg, 20.8 – 18.9 km/l) |
| CO2 emissions | 125-140 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7 sec |
| Acceleration 0 – 62 mph | 7 sec |
| Acceleration 0 – 60 mph | 6.7 sec |
| Maximum speed | 240 km/h (149.13 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 7.5 kg/Hp, 132.5 Hp/tonne |
| Weight-to-torque ratio | 3.1 kg/Nm, 324.7 Nm/tonne |
| Power | 204 Hp @ 4200 rpm |
| Torque | 500 Nm @ 1600-1800 rpm (368.78 lb.-ft. @ 1600-1800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 651.911 |
| Engine displacement | 2143 cm3 (130.77 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 99 mm (3.9 in.) |
| Compression ratio | 16.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Twin-Turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Kerb Weight | 1540 kg (3395.12 lbs.) |
| Max. weight | 2130 kg (4695.85 lbs.) |
| Max load | 590 kg (1300.73 lbs.) |
| Trunk (boot) space (minimum) | 475 l (16.77 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal | 12.98 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.) |
| Length | 4591 mm (180.75 in.) |
| Width | 1770 mm (69.69 in.) |
| Width including mirrors | 2008 mm (79.06 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 | 775 mm (30.51 in.) |
| Rear overhang | 1056 mm (41.57 in.) |
| Drag coefficient (Cd) | 0.26 |
| Minimum turning circle | 10.84 m (35.56 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 6 |
| Gearbox type | Manual transmission |
| Front suspension | Independent type McPherson, Transverse stabilizer |
| Rear suspension | Independent multi-link suspension, Transverse stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 205/55 R16; 225/45 R17 |
| Wheel rims size | 7J x 16; 7.5J x 17 |
The Mercedes-Benz C 250 CDI BlueEFFICIENCY, produced from 2011 to 2014, was a crucial variant within the W204 facelifted C-Class range. Positioned as a fuel-efficient and torque-rich option, it appealed to buyers seeking a balance between performance and economy in the compact executive segment. This model showcased Mercedes-Benz’s dedication to diesel technology, delivering a refined driving experience and impressive fuel economy. It was primarily sold in Europe and other regions where diesel engines were popular, with limited availability in other markets.
Powertrain & Engine Architecture
The C 250 CDI BlueEFFICIENCY’s core is the OM 651.911 2.1-liter inline-four diesel engine. This engine is a technologically advanced design featuring common-rail direct injection and a twin-turbocharger system. The twin-turbo setup, utilizing a small, low-pressure turbo and a larger, high-pressure turbo, provides both quick throttle response and sustained power. The engine incorporates a sophisticated piezo-electric fuel injection system capable of multiple injections per cycle, optimizing combustion and reducing noise. The valvetrain employs a double overhead camshaft (DOHC) design with four valves per cylinder. Its 16.2:1 compression ratio is typical for a modern diesel, contributing to its thermal efficiency. A 6-speed manual transmission was standard, with an optional 7G-TRONIC PLUS automatic transmission available, offering smooth and efficient gear changes.
Driving Characteristics
The C 250 CDI BlueEFFICIENCY offered a distinct driving experience compared to its gasoline counterparts. The 500 Nm (368.78 lb.-ft.) of torque, readily available from 1600-1800 rpm, provided strong acceleration and relaxed cruising. While not as fast as the C 350, the C 250 CDI felt responsive and capable in most situations. The 0-60 mph time of around 6.7 seconds was respectable for a diesel sedan. The manual transmission offered precise shifts, while the optional automatic provided seamless gear changes. The engine was relatively quiet for a diesel, with noticeable noise reduction compared to older diesel engines. The rear-wheel-drive configuration contributed to balanced handling, though it could exhibit oversteer in challenging conditions.
Equipment & Trim Levels
The C 250 CDI BlueEFFICIENCY came standard with features like automatic climate control, a multi-function steering wheel, power windows and mirrors, and a basic audio system. Upholstery was typically cloth, with leather available as an upgrade. Higher trim levels added features such as a sunroof, upgraded audio systems, navigation, and parking sensors. The interior design reflected Mercedes-Benz’s focus on quality materials and a sophisticated aesthetic. The dashboard was clean and functional, with intuitive controls. Optional extras included sport suspension, AMG styling packages, and various driver assistance systems.
Chassis & Braking
The C 250 CDI BlueEFFICIENCY featured a McPherson strut front suspension and a multi-link rear suspension, providing a comfortable ride and good handling. Stabilizer bars on both axles reduced body roll. The braking system used ventilated discs on all four wheels, offering ample stopping power. Anti-lock braking system (ABS) was standard for enhanced safety and stability. The steering was a rack-and-pinion system with hydraulic power assistance, delivering precise and responsive steering feel.
Market Reception & Comparison
The C 250 CDI BlueEFFICIENCY received positive reviews from automotive critics. It was praised for its fuel efficiency, strong torque, and refined driving experience. Compared to the C 200 CDI, the C 250 CDI offered a noticeable performance increase, though at a higher price and slightly reduced fuel economy. Compared to the C 350, the C 250 CDI provided better fuel economy and lower running costs, but lacked the C 350’s outright speed. The C 250 CDI proved popular with drivers prioritizing fuel efficiency and torque.
Legacy
The OM 651 engine family, including the 2.1-liter version in the C 250 CDI BlueEFFICIENCY, has proven remarkably durable and reliable. With proper maintenance, these engines can easily surpass 200,000 miles. The C 250 CDI BlueEFFICIENCY remains a sought-after option in the used car market, particularly for those seeking a fuel-efficient and dependable compact executive sedan. Despite increasingly stringent diesel emissions regulations, the C 250 CDI BlueEFFICIENCY continues to offer a compelling combination of performance, economy, and refinement.
