The Mercedes-Benz C-Class T-modell (S203) facelift, specifically the AMG C 30 CDI Automatic produced between April and December 2004, represents a compelling blend of performance and practicality within the compact executive estate car segment. This variant, positioned as a high-performance diesel offering, occupied a niche above the more common C 200 CDI and C 220 CDI models, but below the more exclusive C 55 AMG. It was designed to appeal to buyers seeking a sporty driving experience coupled with the efficiency and torque characteristic of a diesel engine, all within the versatile body style of a station wagon. The S203 generation, produced from 2000 to 2007, was Mercedes-Benz’s entry into the premium compact estate market, competing with models like the Audi A4 Avant and BMW 3 Series Touring.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-class |
| Generation | C-class T-modell (S203, facelift 2004) |
| Type (Engine) | AMG C 30 CDI (231 Hp) Automatic |
| Start of production | April, 2004 |
| End of production | December, 2004 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (economy) – urban (NEDC) | 10.4 l/100 km (22.6 US mpg, 27.2 UK mpg, 9.6 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 6.1 l/100 km (38.6 US mpg, 46.3 UK mpg, 16.4 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 7.9 l/100 km (29.8 US mpg, 35.8 UK mpg, 12.7 km/l) |
| CO2 emissions (NEDC) | 210 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 | 245 km/h (152.24 mph) |
| Emission standard | Euro 3 |
| Weight-to-power ratio | 7.1 kg/Hp, 141.7 Hp/tonne |
| Weight-to-torque ratio | 3 kg/Nm, 331.3 Nm/tonne |
| Power | 231 Hp @ 3800 rpm |
| Power per litre | 78.3 Hp/l |
| Torque | 540 Nm @ 2000-2500 rpm (398.28 lb.-ft. @ 2000-2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 612.990 |
| Engine displacement | 2950 cm3 (180.02 cu. in.) |
| Number of cylinders | 5 |
| Engine configuration | Inline |
| Cylinder Bore | 88 mm (3.46 in.) |
| Piston Stroke | 97 mm (3.82 in.) |
| Compression ratio | 16.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 11 l (11.62 US qt | 9.68 UK qt) |
| Kerb Weight | 1630 kg (3593.53 lbs.) |
| Max. weight | 2210 kg (4872.22 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.) |
| Length | 4541 mm (178.78 in.) |
| Width | 1728 mm (68.03 in.) |
| Width including mirrors | 1980 mm (77.95 in.) |
| Height | 1455 mm (57.28 in.) |
| Wheelbase | 2715 mm (106.89 in.) |
| Front track | 1493 mm (58.78 in.) |
| Rear (Back) track | 1478 mm (58.19 in.) |
| Front overhang | 755 mm (29.72 in.) |
| Rear overhang | 1071 mm (42.17 in.) |
| Drag coefficient (Cd) | 0.31 |
| Minimum turning circle (turning diameter) | 10.76 m (35.3 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 5 gears, automatic 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 | Front wheel tires: 225/45 R 17Rear wheel tires: 245/40 R 17 |
| Wheel rims size | Front wheel rims: 7.5 J x 17 H 2Rear wheel rims: 8.5 J x 17 H 2 |
Powertrain & Engine Architecture
The heart of the AMG C 30 CDI is the OM 612.990 3.0-liter inline-five cylinder diesel engine. This engine is a significant departure from the more common four-cylinder diesels found in the C-Class range. It features a cast iron block, aluminum cylinder head with four valves per cylinder (DOHC), and a sophisticated common rail direct injection system. The common rail system, operating at extremely high pressures, allows for precise fuel metering and optimized combustion. A variable geometry turbocharger with an intercooler further enhances performance by increasing air intake and reducing intake air temperature. The engine produces 231 horsepower at 3800 rpm and a substantial 540 Nm (398 lb-ft) of torque between 2000 and 2500 rpm. This torque output provides strong acceleration and effortless cruising. The engine is mated to a five-speed automatic transmission, specifically designed to handle the engine’s high torque output. This transmission features a torque converter and electronic control for smooth and efficient gear changes.
Driving Characteristics
The AMG C 30 CDI Automatic delivers a unique driving experience. The high torque output of the engine provides strong acceleration from low speeds, making it well-suited for everyday driving and overtaking maneuvers. While not as overtly sporty as the C 55 AMG, the C 30 CDI offers a more refined and relaxed driving experience. The automatic transmission shifts smoothly, although it may not be as responsive as a manual gearbox. Compared to the standard C-Class diesel models, the C 30 CDI offers significantly improved performance. The 0-60 mph time of around 6.7 seconds is respectable for a diesel estate car. The suspension is tuned for a balance between comfort and handling, providing a stable and controlled ride. The rear-wheel drive configuration contributes to a balanced feel, although it can be less forgiving in slippery conditions compared to all-wheel drive systems.
Equipment & Trim Levels
The AMG C 30 CDI Automatic typically came well-equipped, reflecting its position as a premium variant. Standard features included automatic climate control, power windows and mirrors, a multi-function steering wheel, and a high-quality audio system. The interior featured sports seats upholstered in a combination of leather and fabric. Optional extras included a sunroof, navigation system, upgraded audio system, and parking sensors. The exterior styling was enhanced with AMG body styling, including a front spoiler, side skirts, and a rear diffuser. Alloy wheels were also standard, typically 17-inch in diameter.
Chassis & Braking
The C 30 CDI utilized the standard S203 chassis, featuring independent suspension all around. The front suspension employed a McPherson strut design, while the rear suspension utilized a multi-link setup. Both ends were equipped with a transverse stabilizer bar to reduce body roll. The braking system consisted of ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) was standard, enhancing safety and stability during braking. The steering was a rack and pinion system with hydraulic power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The AMG C 30 CDI Automatic was generally well-received by automotive critics. It was praised for its strong performance, refined driving experience, and practicality. However, some critics noted that the five-speed automatic transmission felt somewhat dated compared to newer transmissions with more gears. Compared to the C 200 CDI and C 220 CDI models, the C 30 CDI offered a significant performance upgrade, but at a higher price point. Fuel economy was respectable for a high-performance diesel, averaging around 30 mpg in combined driving. Reliability was generally good, although the complex common rail injection system could be prone to issues if not properly maintained.
Legacy
The Mercedes-Benz C-Class T-modell (S203) AMG C 30 CDI Automatic has become a sought-after model in the used car market. Its combination of performance, practicality, and relative rarity makes it an appealing option for enthusiasts. The OM 612 engine is known for its durability, but regular maintenance is essential to ensure long-term reliability. Common issues include injector failure and turbocharger wear. Despite these potential issues, the C 30 CDI remains a capable and enjoyable estate car, offering a unique blend of German engineering and diesel power.
