The Mercedes-Benz C-Class Coupe (C204) facelift, specifically the C 250 CDI BlueEFFICIENCY model produced from 2011 to 2015, represented a compelling blend of performance, efficiency, and luxury within the compact executive coupe segment. Positioned as a mid-range offering in the C-Class Coupe lineup, it slotted between the entry-level C 220 CDI and the more potent C 350 models. This variant aimed to provide a refined driving experience with strong fuel economy, appealing to buyers seeking a sophisticated and practical coupe.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-Class |
| Generation | C-Class Coupe (C204, facelift 2011) |
| Type (Engine) | C 250 CDI BlueEFFICIENCY (204 Hp) 7G-TRONIC PLUS |
| Start of production | 2011 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 6.1-6.5 l/100 km (38.6 – 36.2 US mpg) |
| Fuel consumption (extra urban) | 4.2-4.6 l/100 km (56 – 51.1 US mpg) |
| Fuel consumption (combined) | 4.9-5.3 l/100 km (48 – 44.4 US mpg) |
| CO2 emissions | 128-139 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.1 sec |
| Acceleration 0 – 62 mph | 7.1 sec |
| Acceleration 0 – 60 mph | 6.7 sec |
| Maximum speed | 240 km/h (149.13 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 7.8 kg/Hp |
| Weight-to-torque ratio | 3.2 kg/Nm |
| 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 | 1585 kg (3494.33 lbs.) |
| Max. weight | 2130 kg (4695.85 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 Architecture | Rear wheel drive |
| Number of gears | 7 |
| Gearbox type | Automatic transmission G-TRONIC PLUS |
| 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 C-Class Coupe, launched in 2009 and receiving a significant facelift in 2011, was Mercedes-Benz’s entry into the increasingly popular compact executive coupe market. The facelift brought revised styling, improved efficiency, and updated technology. The C 250 CDI BlueEFFICIENCY, introduced with the facelift, was a diesel-powered variant designed to offer a balance between performance and fuel economy. It utilized a sophisticated common-rail diesel engine and a seven-speed automatic transmission, aiming to deliver a refined and comfortable driving experience. This model was primarily sold in Europe and other markets where diesel engines were favored, offering a premium alternative to gasoline-powered coupes.
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 featuring common-rail direct injection and a twin-turbocharger setup. The twin-turbo system, consisting of a small, low-pressure turbo and a larger, high-pressure turbo, works in sequence to minimize turbo lag and provide 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. The 7G-TRONIC PLUS seven-speed automatic transmission is a key component of this powertrain. This transmission is known for its smooth and quick shifts, contributing to both performance and fuel efficiency. It features a torque converter lock-up clutch that engages at higher speeds to reduce slippage and improve fuel economy. The transmission also offers a manual shift mode for drivers who prefer more control.
Driving Characteristics
The C 250 CDI BlueEFFICIENCY offered a surprisingly capable driving experience. While not as overtly sporty as some of its gasoline-powered siblings, the 500 Nm (368.78 lb.-ft.) of torque available from 1600-1800 rpm provided strong acceleration and effortless cruising. The 7G-TRONIC PLUS transmission was well-matched to the engine, providing smooth and timely gear changes. The gear ratios were optimized for both fuel efficiency and performance, allowing the car to accelerate briskly in most situations. Compared to the C 220 CDI, the C 250 CDI offered a noticeable increase in power and torque, resulting in quicker acceleration and improved passing performance. However, it didn’t possess the higher-revving nature and outright power of the C 350. The rear-wheel-drive configuration provided a balanced feel, although it could be prone to oversteer in challenging conditions.
Equipment & Trim Levels
The C 250 CDI BlueEFFICIENCY typically came well-equipped as standard. Common features included automatic climate control, a multi-function steering wheel, power-adjustable front seats, and a high-quality audio system. The interior typically featured a combination of leather and fabric upholstery, with aluminum or wood trim accents. Optional extras included a panoramic sunroof, a navigation system, upgraded leather upholstery, and a premium sound system. The “BlueEFFICIENCY” designation indicated the inclusion of fuel-saving technologies such as start-stop functionality and optimized aerodynamics. Safety features such as ABS, ESP, and multiple airbags were standard.
Chassis & Braking
The C 250 CDI BlueEFFICIENCY utilized a McPherson strut front suspension and a multi-link rear suspension. This setup provided a good balance between ride comfort and handling. Stabilizer bars were fitted to both the front and rear axles to reduce body roll during cornering. The braking system consisted of ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) and ESP (Electronic Stability Program) were standard safety features, enhancing stability and control.
Market Reception & Comparison
The C 250 CDI BlueEFFICIENCY was generally well-received by automotive critics. It was praised for its fuel efficiency, strong torque, and comfortable ride. However, some critics noted that the engine could be somewhat noisy compared to gasoline engines. Compared to other trims in the C-Class Coupe lineup, the C 250 CDI offered a compelling value proposition for buyers prioritizing fuel economy and torque. It was more affordable than the C 350 while offering significantly more performance than the C 220 CDI. In terms of reliability, the OM 651 engine proved to be a robust and durable unit, although regular maintenance was essential to ensure longevity.
Legacy
The C 250 CDI BlueEFFICIENCY remains a popular choice in the used car market, particularly in Europe. Its combination of fuel efficiency, performance, and luxury has made it a desirable option for buyers seeking a refined and practical coupe. The OM 651 engine is known for its longevity and relatively low maintenance costs, making it a reliable choice for long-term ownership. However, potential buyers should be aware of the potential for diesel particulate filter (DPF) issues, particularly if the vehicle has been primarily used for short trips. Overall, the C 250 CDI BlueEFFICIENCY represents a well-engineered and capable coupe that continues to offer a compelling driving experience.
