The Mercedes-Benz C 250d, part of the W205 C-Class generation produced from 2014 to 2016, represented a significant step forward in the compact executive car segment. Positioned as a mid-range offering within the W205 lineup, it aimed to balance fuel efficiency with respectable performance, appealing to buyers seeking a refined and economical luxury sedan. This variant combined a 2.1-liter turbocharged diesel engine with the 7G-TRONIC PLUS seven-speed automatic transmission, offering a compelling alternative to the gasoline-powered C 250 and the higher-performance C 300 models.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-class |
| Generation | C-class (W205) |
| Type (Engine) | C 250d (204 Hp) 7G-TRONIC PLUS |
| Start of production | 2014 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 5.5-5.3 l/100 km (42.8 – 44.4 US mpg) |
| Fuel consumption (extra urban) | 3.9-3.6 l/100 km (60.3 – 65.3 US mpg) |
| Fuel consumption (combined) | 4.5-4.3 l/100 km (52.3 – 54.7 US mpg) |
| CO2 emissions | 117-109 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 | 247 km/h (153.48 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 7.5 kg/Hp |
| Weight-to-torque ratio | 3 kg/Nm |
| Power | 204 Hp @ 3800 rpm |
| Torque | 500 Nm @ 1600-1800 rpm (368.78 lb.-ft. @ 1600-1800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 651.921 |
| Engine displacement | 2143 cm3 (130.77 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Compression ratio | 16.2:1 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | BiTurbo, Intercooler |
| Engine oil capacity | 6 l (6.34 US qt | 5.28 UK qt) |
| Coolant capacity | 9.5 l (10.04 US qt | 8.36 UK qt) |
| Kerb Weight | 1520 kg (3351.03 lbs.) |
| Max. weight | 2160 kg (4761.98 lbs.) |
| Max load | 640 kg (1410.96 lbs.) |
| Trunk (boot) space – minimum | 480 l (16.95 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Length | 4686 mm (184.49 in.) |
| Width | 1810 mm (71.26 in.) |
| Height | 1442 mm (56.77 in.) |
| Wheelbase | 2840 mm (111.81 in.) |
| Front track | 1588 mm (62.52 in.) |
| Rear track | 1570 mm (61.81 in.) |
| Ride height (ground clearance) | 92 mm (3.62 in.) |
| Minimum turning circle | 11.22 m (36.81 ft.) |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Number of gears | 7 |
| Gearbox type | Automatic transmission G-TRONIC |
Powertrain & Engine Architecture
The heart of the C 250d is the OM 651.921 2.1-liter inline-four diesel engine. This engine, a mainstay of the Mercedes-Benz lineup, utilizes a sophisticated common-rail direct injection system and a twin-turbocharger setup. The two turbochargers – a smaller, variable geometry turbo for quick response at low engine speeds and a larger turbo for increased power at higher RPMs – work in concert to deliver a broad torque curve. The engine boasts a high compression ratio of 16.2:1, contributing to its thermal efficiency. The 7G-TRONIC PLUS seven-speed automatic transmission is known for its smooth and quick shifts, enhancing both performance and fuel economy. This transmission features a torque converter lock-up clutch that engages in most gears, minimizing slippage and improving efficiency.
Driving Characteristics
The C 250d with the 7G-TRONIC PLUS transmission offers a comfortable and refined driving experience. While not as overtly sporty as the C 300, it provides ample power for everyday driving and highway cruising. The 500 Nm (368.78 lb-ft) of torque, available from a low 1600-1800 rpm, provides strong acceleration in most situations. The automatic transmission is well-programmed, offering smooth gear changes and responsive kickdown. Compared to the six-speed manual transmission available on some C 250d models, the 7G-TRONIC PLUS prioritizes comfort and ease of use over outright driver engagement. The gear ratios are optimized for fuel efficiency, but also provide sufficient acceleration for overtaking maneuvers.
Equipment & Trim Levels
The C 250d typically came standard with features such as automatic climate control, a multi-function steering wheel, power-adjustable front seats, and a high-quality audio system. Interior upholstery was generally a combination of Artico leatherette and fabric, with optional upgrades to full leather available. The dashboard layout was clean and modern, featuring a central infotainment screen controlled by a rotary dial and buttons. Common optional extras included a sunroof, navigation system, parking assist, and advanced driver-assistance systems like lane keeping assist and blind spot monitoring. Trim levels varied slightly by market, but generally offered packages that bundled together popular options.
Chassis & Braking
The W205 C-Class features a sophisticated chassis design with a four-link front suspension and a multi-link rear suspension. This setup provides a good balance between ride comfort and handling precision. The C 250d typically came equipped with ventilated disc brakes at the front and solid disc brakes at the rear. Anti-lock braking system (ABS) and electronic stability control (ESC) were standard safety features. The steering system utilizes a rack-and-pinion setup, providing precise and responsive steering feel. The suspension tuning was generally geared towards comfort, but the C 250d still offered a reasonably engaging driving experience.
Market Reception & Comparison
The C 250d was generally well-received by automotive critics, who praised its fuel efficiency, refined ride, and comfortable interior. It was often seen as a more sensible alternative to the gasoline-powered C 250, offering similar performance with significantly better fuel economy. Compared to the C 300, the C 250d offered less outright power, but its lower running costs and relaxed driving experience appealed to a different type of buyer. Reliability was generally good, although some owners reported issues with the diesel particulate filter (DPF) system, particularly on vehicles driven primarily on short trips.
Legacy
The OM 651 engine family, including the 2.1-liter unit found in the C 250d, has proven to be a durable and reliable powertrain. While modern diesel technology has evolved, these engines continue to offer good fuel economy and respectable performance. On the used car market, the C 250d represents a good value proposition for buyers seeking a comfortable and economical luxury sedan. Regular maintenance, including timely oil changes and DPF servicing, is crucial to ensure the long-term reliability of this powertrain. The W205 C-Class, and the C 250d in particular, helped solidify Mercedes-Benz’s position as a leader in the compact executive car segment.
