The Mercedes-Benz C-Class T-modell (S203) facelift, produced from December 2004 to May 2007, represented a significant update to the first-generation C-Class estate. The C 320 CDI V6 7G-TRONIC variant occupied a premium position within the lineup, offering a blend of performance, luxury, and practicality. This model was primarily aimed at the European market, where the station wagon (estate) body style held considerable popularity. It served as a more versatile alternative to the C-Class sedan, appealing to buyers needing increased cargo capacity without sacrificing the Mercedes-Benz driving experience.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-Class |
| Generation | C-Class T-modell (S203, facelift 2004) |
| Type (Engine) | C 320 CDI V6 (224 Hp) 7G-TRONIC |
| Start of production | December, 2004 |
| End of production | May, 2007 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 10.5-10.9 l/100 km (22.4 – 21.6 US mpg) |
| Fuel consumption (extra urban) | 5.9-6.1 l/100 km (39.9 – 38.6 US mpg) |
| Fuel consumption (combined) | 7.6-7.9 l/100 km (30.9 – 29.8 US mpg) |
| CO2 emissions | 199-208 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 | 241 km/h (149.75 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 7.3 kg/Hp |
| Weight-to-torque ratio | 3.2 kg/Nm |
| Power | 224 Hp @ 3800 rpm |
| Torque | 510 Nm @ 1600-2800 rpm (376.16 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.910 |
| 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 | SOHC |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant capacity | 7.6 l (8.03 US qt | 6.69 UK qt) |
| Kerb Weight | 1625 kg (3582.51 lbs.) |
| Max. weight | 2205 kg (4861.19 lbs.) |
| Max load | 580 kg (1278.68 lbs.) |
| Trunk (boot) space – minimum | 470 l (16.6 cu. ft.) |
| Trunk (boot) space – maximum | 1384 l (48.88 cu. ft.) |
| Fuel tank capacity | 62 l (16.38 US gal | 13.64 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load (braked) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load (unbraked) | 750 kg (1653.47 lbs.) |
| Length | 4541 mm (178.78 in.) |
| Width | 1728 mm (68.03 in.) |
| Width including mirrors | 1980 mm (77.95 in.) |
| Height | 1465 mm (57.68 in.) |
| Wheelbase | 2715 mm (106.89 in.) |
| Front track | 1493 mm (58.78 in.) |
| Rear track | 1464 mm (57.64 in.) |
| Front overhang | 755 mm (29.72 in.) |
| Rear overhang | 1071 mm (42.17 in.) |
| Drag coefficient (Cd) | 0.31 |
| Minimum turning circle | 10.76 m (35.3 ft.) |
| Drivetrain | Rear wheel drive |
| Number of gears | 7 |
| Gearbox type | Automatic transmission |
| 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 |
| Tires size | 225/45 R 17 |
| Wheel rims size | 7.5 J x 17 H 2 |
Powertrain & Engine Architecture
The C 320 CDI T-modell was powered by the OM 642.910, a 3.0-liter V6 turbodiesel engine. This engine was a cornerstone of Mercedes-Benz’s diesel offerings in the mid-2000s, known for its robust construction and refined operation. The engine featured a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A single turbocharger with an intercooler boosted power output to 224 horsepower at 3800 rpm and a substantial 510 Nm (376 lb-ft) of torque between 1600 and 2800 rpm. The engine employed a single overhead camshaft (SOHC) valvetrain with four valves per cylinder. The 7G-TRONIC automatic transmission, a seven-speed unit, was standard. This transmission offered smooth shifts and contributed to both performance and fuel efficiency. The transmission’s gear ratios were tuned to maximize the engine’s torque, providing strong acceleration in everyday driving situations.
Driving Characteristics
The C 320 CDI T-modell offered a compelling driving experience. The high torque output of the V6 diesel meant strong acceleration from low engine speeds, making it effortless to overtake and merge onto highways. While not a sports car, the combination of 224 hp and the 7G-TRONIC transmission allowed for a 0-60 mph time of around 6.7 seconds. Compared to the base 1.8-liter gasoline models, the C 320 CDI provided significantly more power and a more relaxed driving experience, especially when fully loaded. Compared to the C 320 gasoline variant, the CDI offered superior fuel economy and a broader torque curve. The 7G-TRONIC transmission’s programming prioritized smooth shifts over aggressive downshifts, resulting in a comfortable ride.
Equipment & Trim Levels
The C 320 CDI T-modell typically came well-equipped. Standard features included automatic climate control, power windows and mirrors, a multi-function steering wheel, and a high-quality audio system. Interior upholstery was typically a combination of fabric and leatherette, with full leather options available as an upgrade. Optional extras included a sunroof, navigation system, premium sound system, and parking sensors. The facelifted S203 models also benefited from revised interior trim and updated infotainment systems compared to pre-facelift versions.
Chassis & Braking
The C 320 CDI T-modell featured a fully independent suspension system. The front utilized a McPherson strut setup, while the rear employed a multi-link suspension. Both ends were equipped with a transverse stabilizer bar to reduce body roll. Braking duties were handled by ventilated discs at the front and solid discs at the rear, coupled with an Anti-lock Braking System (ABS). The suspension tuning was geared towards comfort, providing a compliant ride without sacrificing handling. The steering was a hydraulic power-assisted rack and pinion system, offering precise control and feedback.
Market Reception & Comparison
The C 320 CDI T-modell was generally well-received by automotive critics. It was praised for its powerful and efficient engine, comfortable ride, and spacious interior. Fuel economy was a strong point, with combined figures ranging from 7.6 to 7.9 liters per 100 kilometers (approximately 31-30 mpg US). Compared to the C 220 CDI, the C 320 CDI offered a noticeable performance upgrade, but at a higher price point. Reliability was generally good, although diesel particulate filter (DPF) issues could arise with infrequent long-distance driving.
Legacy
The OM 642 engine family, including the 3.0-liter V6 used in the C 320 CDI, has proven to be remarkably durable. Well-maintained examples continue to provide reliable service today. However, potential buyers should be aware of the possibility of DPF issues and the need for regular maintenance. The C 320 CDI T-modell remains a desirable used car, offering a blend of practicality, luxury, and performance that is still competitive in the modern market. Its robust engine and comfortable ride make it a compelling choice for those seeking a versatile and refined estate car.
