The Mercedes-Benz C 320 V6 Automatic, produced from April 2004 to June 2005, represents a mid-cycle refinement of the W203 C-Class sedan. This variant occupied a premium position within the W203 lineup, offering a blend of performance and luxury aimed at buyers seeking a step up from the base C230 Kompressor models but without the outright sportiness of the C55 AMG. The facelifted W203, introduced in 2004, brought styling updates and revised equipment levels, solidifying the C-Class’s reputation as a strong competitor in the entry-level luxury segment. This particular configuration, pairing the 3.2-liter V6 engine with a five-speed automatic transmission, was designed to provide a comfortable and refined driving experience.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-class |
| Generation | C-class (W203, facelift 2004) |
| Type (Engine) | C 320 V6 (218 Hp) Automatic |
| Start of production | April, 2004 |
| End of production | June, 2005 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban (NEDC) | 14.9 l/100 km (15.8 US mpg, 19 UK mpg, 6.7 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) | 10.2 l/100 km (23.1 US mpg, 27.7 UK mpg, 9.8 km/l) |
| CO2 emissions (NEDC) | 242 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 | 6.8 kg/Hp, 146.3 Hp/tonne |
| Weight-to-torque ratio | 4.8 kg/Nm, 206.7 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 | 1490 kg (3284.89 lbs.) |
| Max. weight | 2035 kg (4486.41 lbs.) |
| Max load | 545 kg (1201.52 lbs.) |
| Trunk (boot) space – minimum | 455 l (16.07 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%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4526 mm (178.19 in.) |
| Width | 1728 mm (68.03 in.) |
| Width including mirrors | 1980 mm (77.95 in.) |
| Height | 1427 mm (56.18 in.) |
| Wheelbase | 2715 mm (106.89 in.) |
| Front track | 1493 mm (58.78 in.) |
| Rear (Back) track | 1464 mm (57.64 in.) |
| Front overhang | 755 mm (29.72 in.) |
| Rear overhang | 1056 mm (41.57 in.) |
| Drag coefficient (Cd) | 0.27 |
| 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 heart of the C 320 V6 is the M112.946 engine, a 3.2-liter naturally aspirated V6. This engine utilizes a three-valve-per-cylinder (three intake, two exhaust) SOHC design and multi-port fuel injection. The M112 engine family was known for its smooth operation and relatively high output for its displacement. The engine’s architecture is longitudinal, meaning it’s mounted lengthwise in the engine bay, driving the rear wheels. Paired with this engine is a five-speed automatic transmission (typically the 722.6), offering smooth shifts and a focus on comfort rather than outright performance. This transmission was a staple in many Mercedes-Benz models of the era and is generally considered reliable with proper maintenance.
Driving Characteristics
The C 320 V6 Automatic delivered a comfortable and refined driving experience. While not as quick as the C55 AMG, the 218 horsepower and 308 lb-ft of torque provided ample power for everyday driving and confident highway passing. The automatic transmission, while smooth, did slightly diminish acceleration compared to the available six-speed manual. Gear ratios were tuned for fuel efficiency and relaxed cruising, rather than aggressive downshifts. The rear-wheel-drive configuration contributed to balanced handling, though it lacked the all-weather capability of the 4MATIC all-wheel-drive system offered on other C-Class models.
Equipment & Trim Levels
The C 320 V6 Automatic typically came well-equipped, reflecting its position as a premium trim level. Standard features included leather upholstery, automatic climate control, power-adjustable front seats, a multi-function steering wheel, and an audio system with a CD changer. Optional extras included a sunroof, navigation system, premium sound system, and heated seats. Interior trim options varied, with wood or aluminum accents available. The overall interior design emphasized luxury and build quality, typical of Mercedes-Benz.
Chassis & Braking
The W203 C-Class featured an independent suspension system at all four wheels. The front utilized a McPherson strut setup, while the rear employed a multi-link suspension. This configuration provided a good balance of ride comfort and handling. The C 320 V6 typically came equipped with ventilated disc brakes at the front and solid disc brakes at the rear. Anti-lock braking system (ABS) was standard. Stabilizer bars were fitted to both the front and rear axles to reduce body roll during cornering.
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 luxurious interior. However, some reviewers noted that the automatic transmission dulled the engine’s performance slightly. Compared to the C230 Kompressor, the C 320 offered significantly more power and a more refined driving experience. Against the C55 AMG, it lacked the outright performance but provided a more comfortable and fuel-efficient option. Fuel economy was reasonable for a V6 engine of this size, averaging around 23 mpg in combined driving. Reliability was generally good, though preventative maintenance was crucial.
Legacy
The M112 engine family, including the 3.2-liter variant found in the C 320, has proven to be relatively durable with proper maintenance. Common issues include occasional oil leaks and sensor failures, but major engine failures are relatively rare. Today, the W203 C 320 V6 Automatic represents an affordable entry point into the Mercedes-Benz ownership experience. Well-maintained examples are sought after by enthusiasts who appreciate the car’s blend of luxury, performance, and reliability. The car’s relatively simple technology compared to modern vehicles makes it a popular choice for DIY mechanics and those seeking a classic Mercedes-Benz experience.
