Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLK |
| Generation | CLK (A209, facelift 2005) |
| Type (Engine) | CLK 320 CDI V6 (224 Hp) 7G-TRONIC |
| Start of production | October, 2005 |
| End of production | July, 2009 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 9.9-10.3 l/100 km (23.8 – 22.8 US mpg) |
| Fuel consumption (extra urban) | 6-6.2 l/100 km (39.2 – 37.9 US mpg) |
| Fuel consumption (combined) | 7.4-7.7 l/100 km (31.8 – 30.5 US mpg) |
| CO2 emissions | 197-205 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.2 sec |
| Acceleration 0 – 62 mph | 7.2 sec |
| Acceleration 0 – 60 mph | 6.8 sec |
| Maximum speed | 246 km/h (152.86 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 7.6 kg/Hp |
| Weight-to-torque ratio | 3.4 kg/Nm |
| Power | 224 Hp @ 3800 rpm |
| Torque | 510 Nm @ 1600-2800 rpm (376.16 lb.-ft. @ 1600-2800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.910 |
| 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 | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant capacity | 7.5 l (7.93 US qt | 6.6 UK qt) |
| Kerb Weight | 1710 kg (3769.9 lbs.) |
| Max. weight | 2250 kg (4960.4 lbs.) |
| Max load | 540 kg (1190.5 lbs.) |
| Trunk (boot) space – minimum | 276 l (9.75 cu. ft.) |
| Trunk (boot) space – maximum | 390 l (13.77 cu. ft.) |
| Fuel tank capacity | 62 l (16.38 US gal | 13.64 UK gal) |
| Length | 4652 mm (183.15 in.) |
| Width | 1740 mm (68.5 in.) |
| Width including mirrors | 1991 mm (78.39 in.) |
| Height | 1415 mm (55.71 in.) |
| Wheelbase | 2715 mm (106.89 in.) |
| Front track | 1497 mm (58.94 in.) |
| Rear track | 1478 mm (58.19 in.) |
| Front overhang | 854 mm (33.62 in.) |
| Rear overhang | 1083 mm (42.64 in.) |
| Minimum turning circle | 10.76 m (35.3 ft.) |
| Drivetrain | Rear wheel drive |
| Number of gears | 7 |
| Gearbox type | Automatic transmission G-TRONIC |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link spring suspension with 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 R17 |
| Rear tires | 245/40 R17 |
| Front wheel rims | 7.5J x 17 |
| Rear wheel rims | 8.5J x 17 |
The Mercedes-Benz CLK 320 CDI, produced from October 2005 to July 2009, represented a compelling blend of performance and efficiency within the A209 CLK facelift generation. This variant, a two-door cabriolet, was positioned as a premium offering, bridging the gap between the more accessible petrol-powered CLK models and the high-performance AMG variants. It featured a potent 3.0-liter turbocharged diesel engine paired with Mercedes’ sophisticated 7G-TRONIC automatic transmission, appealing to drivers seeking a refined grand touring experience with respectable fuel economy. The CLK 320 CDI was primarily marketed in Europe and other regions where diesel engines were favored, offering a luxurious alternative to traditional petrol coupes and convertibles.
Powertrain & Engine Architecture
The heart of the CLK 320 CDI is the OM 642.910 3.0-liter V6 diesel engine. This engine, a mainstay of Mercedes-Benz’s diesel lineup, utilizes a common rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. The engine also features a variable geometry turbocharger (VGT) and an intercooler, enhancing both power and torque across a broad rev range. The V6 configuration provides inherent smoothness, while the four valves per cylinder (DOHC) contribute to efficient gas exchange. The 7G-TRONIC automatic transmission, a seven-speed unit, was a key component of the CLK 320 CDI’s appeal. It offered smooth, quick shifts and contributed to improved fuel economy compared to older automatic transmissions. The transmission featured a torque converter lock-up clutch, further enhancing efficiency at cruising speeds.
Driving Characteristics
The CLK 320 CDI offered a distinctly different driving experience compared to its petrol-powered siblings. While lacking the outright acceleration of the CLK 350 or the performance variants, the 320 CDI delivered a substantial 510 Nm (376 lb-ft) of torque, available from a low 1600 rpm. This resulted in strong mid-range acceleration and effortless cruising. The 7G-TRONIC transmission was well-matched to the engine’s characteristics, providing seamless gear changes and keeping the engine within its optimal power band. The gear ratios were tuned for both fuel efficiency and relaxed highway driving. Compared to the manual transmission options available on other CLK models, the 7G-TRONIC prioritized comfort and ease of use over outright driver engagement.
Equipment & Trim Levels
The CLK 320 CDI typically came well-equipped, reflecting its position as a premium model. Standard features included leather upholstery, automatic climate control, a multi-function steering wheel, and a high-end audio system. Optional extras included features like a panoramic sunroof, heated seats, a navigation system, and upgraded interior trim materials. The exterior styling was largely consistent across the CLK range, with the 320 CDI often distinguished by subtle badging and, in some cases, unique wheel designs. The interior dashboard configuration was typical of the A209 CLK, with a focus on elegant design and user-friendly controls.
Chassis & Braking
The CLK 320 CDI utilized an independent suspension system at all four wheels. The front suspension employed a McPherson strut design with coil springs and an anti-roll bar, while the rear featured a multi-link setup, also with coil springs and a stabilizer bar. This configuration provided a comfortable ride quality while maintaining good handling characteristics. The braking system consisted of ventilated discs on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) was standard, enhancing safety and control during emergency braking situations.
Market Reception & Comparison
The CLK 320 CDI was generally well-received by automotive critics, who praised its blend of performance, fuel economy, and refinement. It was often seen as a more sensible alternative to the petrol-powered CLK models, particularly for drivers who covered long distances. Compared to the CLK 350, the 320 CDI offered similar levels of luxury and comfort but with significantly better fuel economy. However, it lacked the outright performance of the petrol variant. Against other diesel-powered coupes and convertibles in its class, the CLK 320 CDI stood out for its Mercedes-Benz build quality, luxurious interior, and sophisticated technology.
Legacy
The OM 642 engine family, including the 320 CDI variant, has proven to be remarkably durable and reliable. While diesel engines generally require diligent maintenance, these engines are known for their longevity when properly cared for. In the used car market, the CLK 320 CDI remains a desirable option for buyers seeking a stylish and comfortable grand tourer with good fuel economy. However, potential buyers should be aware of the potential maintenance costs associated with diesel engines, including the diesel particulate filter (DPF) and the common rail injection system. Overall, the CLK 320 CDI represents a well-engineered and refined vehicle that continues to offer a compelling ownership experience.
