The Mercedes-Benz C-Class Sport Coupe (CL203) AMG C 30 CDI Automatic, produced from February 2003 to March 2004, represented a performance-oriented variant within the second-generation C-Class (W203) lineup. Positioned as a sporty alternative to the sedan and wagon models, the CL203 coupe offered a more dynamic driving experience. The AMG C 30 CDI, specifically, combined a powerful diesel engine with a five-speed automatic transmission, targeting buyers seeking both performance and efficiency in a compact, three-door package. It was a relatively short-lived model, bridging the gap between the standard C-Class coupes and the more potent AMG models that would follow.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-class |
| Generation | C-class Sport Coupe (CL203) |
| Type (Engine) | AMG C 30 CDI (231 Hp) Automatic |
| Start of production | February, 2003 |
| End of production | March, 2004 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 3 |
| Fuel consumption (economy) – urban (NEDC) | 10.2 l/100 km (23.1 US mpg, 27.7 UK mpg, 9.8 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 5.9 l/100 km (39.9 US mpg, 47.9 UK mpg, 16.9 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 7.6 l/100 km (30.9 US mpg, 37.2 UK mpg, 13.2 km/l) |
| CO2 emissions (NEDC) | 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 rpm (398.28 lb.-ft. @ 2000 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 | 1494 mm (58.82 in.) |
| Rear (Back) track | 1468 mm (57.8 in.) |
| Front overhang | 788 mm (31.02 in.) |
| Rear overhang | 840 mm (33.07 in.) |
| Drag coefficient (Cd) | 0.29 |
| 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 17 91 YRear wheel tires: 245/40 ZR 17 91 Y |
| 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 was the OM 612.990, a 3.0-liter inline-five cylinder diesel engine. This engine was a significant upgrade over the standard four-cylinder diesels offered in the C-Class range. It featured a common rail direct injection system, delivering fuel at extremely high pressure for improved combustion efficiency and reduced emissions. A variable geometry turbocharger with an intercooler further enhanced performance, providing a broad torque curve. The engine produced 231 horsepower at 3800 rpm and a substantial 540 Nm (398 lb-ft) of torque at just 2000 rpm. This torque output was a key characteristic, providing strong acceleration in everyday driving situations. The engine utilized a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The five-speed automatic transmission, while not the latest technology even at the time, was chosen for its smoothness and ability to handle the engine’s torque. It was a conventional torque converter automatic, prioritizing comfort over outright performance.
Driving Characteristics
The AMG C 30 CDI Automatic offered a compelling blend of performance and refinement. The high torque output meant strong acceleration from low engine speeds, making it easy to overtake and merge onto highways. While not as overtly sporty as the gasoline-powered AMG models, the C 30 CDI provided a noticeably quicker driving experience than the standard C-Class diesels. The automatic transmission, while smooth, wasn’t particularly quick to shift, and lacked the responsiveness of a manual gearbox. The gear ratios were tuned for fuel efficiency and comfortable cruising, rather than aggressive acceleration. The rear-wheel drive configuration contributed to a balanced feel, although traction could be a concern in wet conditions. The suspension, while firm enough to provide good body control, wasn’t overly harsh, offering a reasonable level of ride comfort.
Equipment & Trim Levels
The AMG C 30 CDI Automatic typically came well-equipped, reflecting its position as a premium variant. Standard features included sports seats, alloy wheels, a multi-function steering wheel, and automatic climate control. The interior trim often featured aluminum accents and unique upholstery. Optional extras included a sunroof, upgraded audio system, and leather upholstery. The AMG styling package added a more aggressive front bumper, side skirts, and rear spoiler, visually differentiating it from the standard C-Class coupes. Navigation systems were also available as an option, though they were less sophisticated than modern systems.
Chassis & Braking
The CL203 coupe chassis was designed to provide a more engaging driving experience than the sedan. The AMG C 30 CDI featured a McPherson strut front suspension and a multi-link rear suspension, both with transverse stabilizer bars to reduce body roll. Braking duties were handled by ventilated discs on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) was standard. The suspension tuning was slightly firmer than the standard C-Class, contributing to improved handling. The weight distribution was reasonably balanced, enhancing the car’s agility.
Market Reception & Comparison
The AMG C 30 CDI Automatic 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 wasn’t as responsive as a manual gearbox, and that the interior, while well-built, lacked the outright luxury of some competitors. Compared to the standard C-Class coupes, the C 30 CDI offered a significant performance upgrade. Compared to the gasoline-powered AMG models, it provided a more affordable entry point into the AMG brand, albeit with slightly less outright performance. Fuel economy was a key selling point, making it an attractive option for drivers who wanted performance without sacrificing efficiency.
Legacy
The Mercedes-Benz C-Class Sport Coupe (CL203) AMG C 30 CDI Automatic, while a relatively short-lived model, has gained a following among enthusiasts. The OM 612 engine is known for its durability and reliability, provided it is properly maintained. Today, these cars can be found on the used car market at relatively affordable prices. They represent a unique combination of performance, efficiency, and style. Common issues include wear and tear on suspension components and potential problems with the automatic transmission. However, with regular maintenance, these cars can provide many years of reliable service. The C 30 CDI remains a compelling option for those seeking a sporty and economical coupe with a touch of AMG flair.
