The Mercedes-Benz C-Class Sport Coupe (CL203) facelift of 2004 represented a mid-cycle refresh of the first-generation coupe, introducing styling updates and refined mechanical components. The AMG C 30 CDI, produced from April to November 2004, was a performance-oriented diesel variant positioned as a premium offering within the CL203 lineup. It combined the coupe’s sporty aesthetics with the robust power of a five-cylinder turbodiesel engine, aimed at drivers seeking a blend of efficiency and spirited driving. This model occupied a niche between the more mainstream C-Class variants and the full-fledged AMG models like the C32 AMG.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-class |
| Generation | C-class Sport Coupe (CL203, facelift 2004) |
| Type (Engine) | AMG C 30 CDI (231 Hp) Automatic |
| Start of production | April, 2004 |
| End of production | November, 2004 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 3 |
| Fuel consumption (urban) | 10.2 l/100 km (23.1 US mpg, 27.7 UK mpg, 9.8 km/l) |
| Fuel consumption (extra urban) | 5.9 l/100 km (39.9 US mpg, 47.9 UK mpg, 16.9 km/l) |
| Fuel consumption (combined) | 7.6 l/100 km (30.9 US mpg, 37.2 UK mpg, 13.2 km/l) |
| CO2 emissions | 201 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.8 sec |
| Acceleration 0 – 62 mph | 6.8 sec |
| Acceleration 0 – 60 mph | 6.5 sec |
| Maximum speed | 250 km/h (155.34 mph) – Electronically limited |
| Emission standard | Euro 3 |
| Weight-to-power ratio | 6.8 kg/Hp, 147.6 Hp/tonne |
| Weight-to-torque ratio | 2.9 kg/Nm, 345 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 | 1565 kg (3450.23 lbs.) |
| Max. weight | 2095 kg (4618.68 lbs.) |
| Max load | 530 kg (1168.45 lbs.) |
| Trunk (boot) space – minimum | 310 l (10.95 cu. ft.) |
| Trunk (boot) space – maximum | 1100 l (38.85 cu. ft.) |
| Fuel tank capacity | 62 l (16.38 US gal | 13.64 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Length | 4343 mm (170.98 in.) |
| Width | 1728 mm (68.03 in.) |
| Width including mirrors | 1960 mm (77.17 in.) |
| Height | 1401 mm (55.16 in.) |
| Wheelbase | 2715 mm (106.89 in.) |
| Front track | 1493 mm (58.78 in.) |
| Rear track | 1478 mm (58.19 in.) |
| Front overhang | 788 mm (31.02 in.) |
| Rear overhang | 840 mm (33.07 in.) |
| Drag coefficient (Cd) | 0.29 |
| Minimum turning circle | 10.76 m (35.3 ft.) |
| Drivetrain | Rear wheel drive |
| Number of gears | 5 |
| 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 | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Front tires | 225/45 R 17 |
| Rear tires | 245/40 R 17 |
| Front wheel rims | 7.5 J x 17 H 2 |
| Rear wheel rims | 8.5 J x 17 H 2 |
Powertrain & Engine Architecture
The heart of the AMG C 30 CDI was the OM 612.990, a 3.0-liter inline five-cylinder diesel engine. This engine was a significant departure from the four-cylinder diesels commonly found in European C-Class models. It featured a common rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. A variable geometry turbocharger with an intercooler further enhanced performance, providing substantial torque across a broad rev range. The engine boasted a high compression ratio of 16.5:1, contributing to its efficiency. The five-speed automatic transmission, a standard feature, was tuned to handle the engine’s considerable torque output. While not the sportiest automatic available at the time, it provided smooth shifts and adequate responsiveness for everyday driving.
Driving Characteristics
The AMG C 30 CDI offered a unique driving experience. The 540 Nm (398 lb-ft) of torque, available from 2000-2500 rpm, provided strong acceleration in everyday situations. The 0-60 mph time of around 6.5 seconds was respectable for a diesel coupe of that era. Compared to the standard C-Class 1.8L models, the C 30 CDI offered significantly more power and torque, resulting in a more effortless driving experience, particularly when overtaking or climbing hills. However, it wasn’t as nimble or engaging as the C32 AMG, which featured a supercharged V6 engine and a more performance-focused suspension setup. The automatic transmission, while smooth, lacked the immediacy of a manual gearbox, and the engine, while refined for a diesel, wasn’t as rev-happy as its gasoline counterparts.
Equipment & Trim Levels
The AMG C 30 CDI came with a generous level of standard equipment. This included features like automatic climate control, power windows and mirrors, a multi-function steering wheel, and a premium audio system. The interior typically featured sport seats upholstered in a combination of leather and fabric. Optional extras included a sunroof, navigation system, and upgraded audio options. The exterior styling was enhanced with AMG-specific body kit, including unique front and rear bumpers, side skirts, and alloy wheels. The overall aesthetic aimed for a sporty yet sophisticated look.
Chassis & Braking
The CL203 Sport Coupe chassis was designed to provide a balance between comfort and handling. The front suspension utilized a McPherson strut setup with a transverse stabilizer, while the rear featured an independent multi-link suspension, also with a stabilizer bar. The AMG C 30 CDI was equipped with ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) was standard. The suspension was tuned to accommodate the increased weight of the five-cylinder engine, offering a slightly firmer ride compared to the standard C-Class models.
Market Reception & Comparison
The AMG C 30 CDI was generally well-received by automotive critics. It was praised for its strong performance, fuel efficiency, and comfortable ride. However, some reviewers noted that the automatic transmission could feel sluggish at times, and the engine lacked the aural excitement of a gasoline-powered AMG model. Compared to the C 220 CDI, the C 30 CDI offered a significant power upgrade, but at a higher price point. Against the C32 AMG, it provided a more economical option, albeit with less outright performance. Fuel economy was a strong point, with combined figures around 30.9 US mpg.
Legacy
The OM 612 engine family, including the OM 612.990 found in the C 30 CDI, is known for its durability and reliability. When properly maintained, these engines can accumulate high mileage with minimal issues. Today, the AMG C 30 CDI is a relatively rare and sought-after model among Mercedes-Benz enthusiasts. Its combination of performance, efficiency, and unique character makes it an appealing option in the used car market. However, potential buyers should be aware of the potential maintenance costs associated with a diesel engine, including the diesel particulate filter and fuel injection system. Overall, the AMG C 30 CDI represents a compelling blend of performance and practicality within the CL203 C-Class range.
