The Mercedes-Benz C-Class Coupe (C204) facelift C 250 CDI BlueEFFICIENCY, produced from 2011 to 2015, represented a compelling blend of performance, efficiency, and style within the compact luxury coupe segment. Positioned as a mid-range offering in the C204 coupe lineup, it slotted between the entry-level C 220 CDI and the more potent C 350 models. This variant aimed to deliver a refined driving experience with a focus on fuel economy, appealing to buyers seeking a sophisticated and practical coupe. The “BlueEFFICIENCY” designation signified Mercedes-Benz’s commitment to maximizing fuel efficiency through various technological enhancements.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-Class |
| Generation | C-Class Coupe (C204, facelift 2011) |
| Type (Engine) | C 250 CDI BlueEFFICIENCY (204 Hp) |
| Start of production | 2011 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 6.2-6.8 l/100 km (37.9 – 34.6 US mpg, 45.6 – 41.5 UK mpg, 16.1 – 14.7 km/l) |
| Fuel consumption (extra urban) | 4.1-4.6 l/100 km (57.4 – 51.1 US mpg, 68.9 – 61.4 UK mpg, 24.4 – 21.7 km/l) |
| Fuel consumption (combined) | 4.9-5.4 l/100 km (48 – 43.6 US mpg, 57.6 – 52.3 UK mpg, 20.4 – 18.5 km/l) |
| CO2 emissions | 128-143 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 | 7.7 kg/Hp, 129.1 Hp/tonne |
| Weight-to-torque ratio | 3.2 kg/Nm, 316.5 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 | 1580 kg (3483.3 lbs.) |
| Max. weight | 2125 kg (4684.82 lbs.) |
| Max load | 545 kg (1201.52 lbs.) |
| Trunk (boot) space (minimum) | 450 l (15.89 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 | 4590 mm (180.71 in.) |
| Width | 1770 mm (69.69 in.) |
| Width including mirrors | 1997 mm (78.62 in.) |
| Height | 1406 mm (55.35 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 | 1055 mm (41.54 in.) |
| Drag coefficient (Cd) | 0.26 |
| Minimum turning circle | 10.84 m (35.56 ft.) |
| Drivetrain | 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 | 225/45 R17 |
| Wheel rims size | 7.5J x 17 |
INTRODUCTION
The C204 Mercedes-Benz C-Class Coupe, launched in 2009 and receiving a significant facelift in 2011, brought a two-door coupe variant to the popular C-Class range. The C 250 CDI BlueEFFICIENCY, introduced with the facelift, was a diesel-powered option designed to appeal to European markets prioritizing fuel efficiency and torque. It built upon the foundation of the W204 sedan, offering a more sporty and stylish alternative. The C204 platform aimed to bridge the gap between luxury and practicality, offering a premium experience in a more compact package.
Powertrain & Engine Architecture
At the heart of the C 250 CDI BlueEFFICIENCY lies the OM 651.911 2.1-liter inline-four cylinder diesel engine. This engine is a highly advanced design for its time, featuring common-rail direct injection and a sophisticated twin-turbocharger system. The twin-turbo setup, consisting of a small, low-pressure turbo and a larger, high-pressure turbo, works in concert to minimize turbo lag and deliver a broad, flat torque curve. The engine boasts a high compression ratio of 16.2:1, contributing to its efficiency. The engine utilizes a Double Overhead Camshaft (DOHC) valvetrain with four valves per cylinder, optimizing airflow for improved performance. The 6-speed manual transmission was standard, providing precise gear changes and a direct connection to the engine. The BlueEFFICIENCY package included features like optimized aerodynamics, low-rolling resistance tires, and an engine start-stop system to further reduce fuel consumption.
Driving Characteristics
The C 250 CDI BlueEFFICIENCY offered a distinctly different driving experience compared to its gasoline-powered siblings. While lacking the outright acceleration of the C 350, it compensated with a substantial 500 Nm (368 lb-ft) of torque available from just 1600-1800 rpm. This abundant torque provided effortless acceleration in everyday driving situations and strong performance when overtaking. The 6-speed manual transmission allowed for precise control, but the gear ratios were tuned more for fuel efficiency than outright performance. Compared to the C 220 CDI, the C 250 CDI offered a noticeable power increase, resulting in quicker acceleration and a more confident feel. The rear-wheel-drive configuration contributed to a balanced chassis and engaging handling, although it wasn’t as sharp as some of its competitors.
Equipment & Trim Levels
The C 250 CDI BlueEFFICIENCY came reasonably well-equipped as standard. Interior features typically included automatic climate control, a multi-function steering wheel, and premium cloth upholstery. Optional extras were plentiful, allowing buyers to personalize their vehicle. Popular options included leather upholstery, a panoramic sunroof, a premium sound system, and Mercedes-Benz’s COMAND infotainment system with navigation. Exterior options included various wheel designs, metallic paint finishes, and a sports package that added more aggressive styling cues.
Chassis & Braking
The C 250 CDI BlueEFFICIENCY utilized a McPherson strut front suspension and a multi-link rear suspension, providing a comfortable yet controlled ride. Stabilizer bars were fitted to both axles to reduce body roll during cornering. The braking system consisted of ventilated discs on all four wheels, providing ample stopping power. Anti-lock Braking System (ABS) was standard, enhancing safety and stability. The suspension tuning was geared towards comfort and refinement, prioritizing a smooth ride over outright sportiness.
Market Reception & Comparison
The C 250 CDI BlueEFFICIENCY was generally well-received by automotive critics, who praised its fuel efficiency, strong torque, and comfortable ride. It was often compared to rivals such as the BMW 320d Coupe and the Audi A5 2.0 TDI. The Mercedes-Benz typically offered a more luxurious interior and a more refined driving experience, while the BMW often provided sharper handling. The Audi A5 was often praised for its stylish design and high-quality interior. In terms of fuel economy, the C 250 CDI BlueEFFICIENCY was competitive with its rivals, offering excellent real-world fuel consumption figures.
Legacy
The OM 651 engine family, including the version used in the C 250 CDI BlueEFFICIENCY, has proven to be remarkably durable and reliable. These engines are known for their longevity and relatively low maintenance costs. On the used car market, the C 250 CDI BlueEFFICIENCY remains a popular choice for buyers seeking a stylish, efficient, and reliable coupe. However, potential buyers should be aware of the potential for diesel particulate filter (DPF) issues, particularly on vehicles that have primarily been used for short journeys. Overall, the C 250 CDI BlueEFFICIENCY represents a well-engineered and well-rounded coupe that continues to offer a compelling value proposition today.
