The Mercedes-Benz C-Class Sport Coupe (CL203 chassis, post-facelift) C 320 V6 Automatic, produced from April 2004 to May 2005, represented a compelling blend of performance and style within the compact luxury coupe segment. Positioned as a mid-range offering in the CL203 lineup, it slotted between the more economical four-cylinder models and the higher-performance C 350 and C 55 AMG variants. This model aimed to provide a refined driving experience with a potent V6 engine and the convenience of an automatic transmission, appealing to buyers seeking a sporty yet comfortable grand tourer. The CL203 Sport Coupe was Mercedes-Benz’s attempt to capture a younger demographic, offering a more dynamic alternative to the traditional C-Class sedan.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-Class |
| Generation | C-Class Sport Coupe (CL203, facelift 2004) |
| Type (Engine) | C 320 V6 (218 Hp) Automatic |
| Start of production | April, 2004 |
| End of production | May, 2005 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 3 |
| Fuel consumption (economy) – urban (NEDC) | 15.6 l/100 km (15.1 US mpg, 18.1 UK mpg, 6.4 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 7.7 l/100 km (30.5 US mpg, 36.7 UK mpg, 13 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 10.6 l/100 km (22.2 US mpg, 26.6 UK mpg, 9.4 km/l) |
| CO2 emissions (NEDC) | 254 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.8 sec |
| Acceleration 0 – 62 mph | 7.8 sec |
| Acceleration 0 – 60 mph | 7.4 sec |
| Maximum speed | 245 km/h (152.24 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 6.7 kg/Hp, 150.3 Hp/tonne |
| Weight-to-torque ratio | 4.7 kg/Nm, 212.4 Nm/tonne |
| Power | 218 Hp @ 5700 rpm |
| Torque | 308 Nm @ 3000-4800 rpm (227.17 lb.-ft. @ 3000-4800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 112.946 |
| Engine displacement | 3199 cm3 (195.21 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 89.9 mm (3.54 in.) |
| Piston Stroke | 84 mm (3.31 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 3 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | SOHC |
| Engine oil capacity | 8 l (8.45 US qt, 7.04 UK qt) |
| Coolant | 10.5 l (11.1 US qt, 9.24 UK qt) |
| Kerb Weight | 1450 kg (3196.7 lbs.) |
| Max. weight | 1980 kg (4365.15 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.) |
| Permitted trailer load with brakes (12%) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load without brakes | 740 kg (1631.42 lbs.) |
| Length | 4343 mm (170.98 in.) |
| Width | 1728 mm (68.03 in.) |
| Width including mirrors | 1960 mm (77.17 in.) |
| Height | 1406 mm (55.35 in.) |
| Wheelbase | 2715 mm (106.89 in.) |
| Front track | 1493 mm (58.78 in.) |
| Rear (Back) track | 1464 mm (57.64 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 | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 205/55 R 16 V |
| Wheel rims size | 7 J x 16 H 2 |
Powertrain & Engine Architecture
The C 320 V6 was powered by the M112.946 engine, a 3.2-liter naturally aspirated V6. This engine featured a 60-degree V-angle, three valves per cylinder (two intake, one exhaust), and a single overhead camshaft (SOHC) design. The M112 engine family was known for its smooth operation and relatively high specific output. Fuel delivery was handled by a multi-port fuel injection system, providing precise fuel metering for optimal combustion. The engine produced 218 horsepower at 5700 rpm and 308 Nm (227 lb-ft) of torque between 3000 and 4800 rpm. Paired with the engine was a 5-speed automatic transmission (likely the 722.6), offering smooth shifts and convenience. This transmission was designed to balance performance and fuel efficiency, with gear ratios tuned for both acceleration and cruising.
Driving Characteristics
The C 320 V6 Automatic offered a comfortable and refined driving experience. While not as overtly sporty as the C 350 or AMG models, it provided ample power for everyday driving and confident highway passing. The automatic transmission, while smooth, did slightly diminish the sense of direct control compared to the available manual transmission. Acceleration from 0 to 60 mph took approximately 7.4 seconds, making it a respectable performer for its time. The V6 engine delivered a broad torque curve, providing good responsiveness across a wide range of engine speeds. The rear-wheel-drive configuration contributed to balanced handling, although traction could be a concern in wet or slippery conditions.
Equipment & Trim Levels
The C 320 V6 Automatic typically came standard with features such as leather upholstery, automatic climate control, power-adjustable front seats, a premium audio system, and alloy wheels. Optional extras included a sunroof, navigation system, upgraded sound system, and various cosmetic enhancements. The interior design was typical of Mercedes-Benz, emphasizing quality materials and a sophisticated aesthetic. The Sport Coupe trim also featured unique styling cues, such as a more aggressive front bumper and side skirts, differentiating it from the standard C-Class sedan.
Chassis & Braking
The CL203 Sport Coupe utilized an independent suspension system at all four corners. The front suspension employed McPherson struts with a transverse stabilizer bar, while the rear featured a multi-link setup, also with a stabilizer bar. This configuration aimed to provide a balance between ride comfort and handling precision. Braking duties were handled by ventilated discs at the front and solid discs at the rear, equipped with ABS (Anti-lock Braking System) for enhanced safety. The steering was a rack-and-pinion system with hydraulic power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The C 320 V6 Automatic was generally well-received by automotive critics. It was praised for its smooth engine, comfortable ride, and refined interior. However, some reviewers noted that the automatic transmission could feel slightly sluggish compared to the manual option. Compared to the C 230 Kompressor, the C 320 offered significantly more power and torque, resulting in noticeably quicker acceleration. Against the C 350, the C 320 provided a more balanced blend of performance and fuel economy, while the C 55 AMG was aimed at a more performance-focused buyer. Fuel economy was rated at around 22.2 US mpg combined, which was reasonable for a V6-powered coupe of that era.
Legacy
The M112 engine family, including the 3.2-liter V6 found in the C 320, is generally considered to be a reliable and durable powerplant. With proper maintenance, these engines can accumulate high mileage without major issues. The 5-speed automatic transmission is also known for its robustness. Today, the CL203 C 320 V6 Automatic represents an affordable entry point into the Mercedes-Benz ownership experience. While not as sought-after as some of the more iconic AMG models, it offers a compelling combination of style, comfort, and performance, making it a desirable classic for enthusiasts.
