The Mercedes-Benz C-Class (W204) C 320 CDI 4MATIC, produced from 2007 to 2009, represented a compelling blend of performance, efficiency, and all-weather capability within the broader W204 C-Class range. Positioned as a mid-to-upper tier offering, it catered to buyers seeking a refined diesel experience with the added security of Mercedes-Benz’s 4MATIC all-wheel-drive system. This variant distinguished itself from the gasoline-powered C300 and C350 models, as well as the more economical C220 CDI, by offering a significant power upgrade and a more luxurious driving experience. It served as a bridge between the entry-level diesels and the higher-performance AMG models.
| Brand | Mercedes-Benz |
| Model | C-Class |
| Generation | C-Class (W204) |
| Type | C 320 CDI V6 (224 Hp) 4MATIC 7G-TRONIC |
| Start of production | 2007 |
| End of production | 2009 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 10.3-10.5 l/100 km (22.8 – 22.4 US mpg) |
| Fuel consumption (extra urban) | 6.2-6.6 l/100 km (37.9 – 35.6 US mpg) |
| Fuel consumption (combined) | 7.7-8 l/100 km (30.5 – 29.4 US mpg) |
| CO2 emissions | 202-211 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.7 sec |
| Acceleration 0 – 60 mph | 6.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 7.5 kg/Hp |
| Weight-to-torque ratio | 3.3 kg/Nm |
| Power | 224 Hp @ 3800 rpm |
| Torque | 510 Nm @ 1600-2800 rpm (376.16 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.961 |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 17.7:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Kerb Weight | 1685 kg (3714.79 lbs.) |
| Max. weight | 2245 kg (4949.38 lbs.) |
| Max load | 560 kg (1234.59 lbs.) |
| Trunk (boot) space | 475 l (16.77 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Permitted trailer load (braked) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load (unbraked) | 750 kg (1653.47 lbs.) |
| Length | 4581 mm (180.35 in.) |
| Width | 1770 mm (69.69 in.) |
| Width (with mirrors) | 2020 mm (79.53 in.) |
| Height | 1447 mm (56.97 in.) |
| Wheelbase | 2760 mm (108.66 in.) |
| Front track | 1549 mm (60.98 in.) |
| Rear track | 1552 mm (61.1 in.) |
| Drag coefficient (Cd) | 0.29 |
| Minimum turning circle | 10.84 m (35.56 ft.) |
| Drivetrain | All wheel drive (4×4) |
| Gearbox | 7 gears, automatic transmission G-TRONIC |
| Front suspension | Independent type McPherson, Transverse stabilizer |
| Rear suspension | Independent multi-link suspension, Transverse stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
Powertrain & Engine Architecture
The heart of the C 320 CDI 4MATIC is the OM 642.961 3.0-liter V6 turbodiesel engine. This engine, a cornerstone of Mercedes-Benz’s diesel offerings in the late 2000s, featured a robust cast iron block and aluminum cylinder heads. It employed a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The engine benefited from a variable geometry turbocharger (VGT) and an intercooler, enhancing both power and torque across a broad RPM range. The V6 configuration provided inherent smoothness compared to inline engines, and the DOHC (Double Overhead Camshaft) valvetrain, with four valves per cylinder, further contributed to its efficiency and performance. The 7G-TRONIC automatic transmission, a seven-speed unit, was specifically tuned to complement the engine’s torque characteristics, providing smooth and responsive shifts. This transmission offered both manual and automatic shifting modes, allowing drivers to tailor the driving experience to their preferences.
Driving Characteristics
The C 320 CDI 4MATIC offered a distinctly different driving experience compared to its gasoline counterparts. While not as overtly sporty as the C350, it delivered strong and readily available torque from as low as 1600 rpm, making it exceptionally capable for everyday driving and overtaking maneuvers. The 7G-TRONIC transmission’s close gear ratios helped keep the engine within its optimal power band. The 4MATIC all-wheel-drive system provided enhanced traction, particularly in inclement weather conditions, inspiring confidence on slippery roads. Compared to the rear-wheel-drive C-Class models, the 4MATIC version exhibited a more neutral handling balance. The automatic transmission, while smooth, could sometimes feel slightly hesitant during quick downshifts, a characteristic common to some early 7G-TRONIC units. However, the overall driving experience was refined and comfortable, prioritizing effortless cruising and confident handling.
Equipment & Trim Levels
The C 320 CDI 4MATIC typically came well-equipped, reflecting its position in the C-Class lineup. Standard features generally included leather upholstery, automatic climate control, a multi-function steering wheel, and a premium audio system. Optional extras were plentiful, allowing buyers to personalize their vehicles. These included a sunroof, navigation system, upgraded sound systems (often from Harman Kardon), parking sensors, and heated seats. Interior trim options ranged from wood veneers to aluminum accents, allowing for a degree of customization. The exterior styling was largely consistent with other W204 C-Class models, but the C 320 CDI 4MATIC often featured unique badging to denote its engine and drivetrain configuration.
Chassis & Braking
The W204 C-Class utilized a sophisticated chassis design, featuring an independent multi-link suspension at the rear and a McPherson strut setup at the front. The C 320 CDI 4MATIC benefited from slightly stiffer spring rates and dampers compared to the base C-Class models to manage the added weight of the all-wheel-drive system and the more powerful engine. Braking duties were handled by ventilated discs at the front and solid discs at the rear, equipped with ABS (Anti-lock Braking System) and electronic brake-force distribution. The steering system employed a hydraulic power steering rack and pinion, providing precise and responsive steering feel.
Market Reception & Comparison
The C 320 CDI 4MATIC was generally well-received by automotive critics. It was praised for its strong performance, fuel efficiency, and comfortable ride. The 4MATIC system was a significant selling point for buyers in regions with harsh winters or challenging road conditions. Compared to the C220 CDI, the C 320 CDI offered a substantial power increase, while maintaining excellent fuel economy. Against the gasoline-powered C300 and C350, it provided a more economical alternative without sacrificing a significant amount of performance. However, some critics noted that the diesel engine’s inherent noise and vibration were more noticeable than in the gasoline models.
Legacy
The OM 642 engine family, including the version found in the C 320 CDI 4MATIC, has proven to be remarkably durable and reliable. With proper maintenance, these engines can accumulate high mileage without major issues. The 7G-TRONIC transmission, while occasionally prone to software glitches in early iterations, has also proven to be generally reliable. Today, the W204 C 320 CDI 4MATIC represents a compelling value proposition in the used car market, offering a blend of luxury, performance, and fuel efficiency. Its robust construction and proven powertrain make it a practical and enjoyable choice for buyers seeking a well-built and capable sedan.
