2005-2009 Mercedes-Benz CLK (A209 facelift ) CLK 320 CDI (224 Hp)

The Mercedes-Benz CLK 320 CDI, produced from October 2005 to July 2009, represents a compelling blend of performance and efficiency within the A209 CLK facelift generation. Positioned as a mid-range offering in the CLK lineup, this variant catered to buyers seeking the prestige of a Mercedes-Benz convertible or coupe, coupled with the fuel economy and torque characteristics of a modern diesel engine. The CLK 320 CDI was primarily marketed in Europe and other regions where diesel engines enjoyed significant popularity, offering a sophisticated alternative to gasoline-powered models.

Technical Specifications

INTRODUCTION

The A209 CLK, introduced in 2002 and facelifted in 2005, represented Mercedes-Benz’s entry into the mid-size coupe and convertible segment. The 320 CDI variant, launched with the 2005 facelift, combined the elegant styling of the CLK with the robust and fuel-efficient OM642 diesel engine. This engine, a 3.0-liter V6, was a cornerstone of Mercedes-Benz’s diesel offerings during the mid-2000s, known for its strong torque output and relatively refined operation. The CLK 320 CDI aimed to provide a more economical and practical alternative to the higher-performance CLK 500 or the more basic four-cylinder models.

Powertrain & Engine Architecture

The heart of the CLK 320 CDI is the OM642.910 engine, a 2,987 cc (182.28 cu. in.) V6 diesel. This engine utilizes a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The OM642 features a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, enhancing volumetric efficiency. A variable geometry turbocharger with an intercooler further boosts power and torque. The engine’s compression ratio is a high 17.7:1, typical for diesel engines, contributing to its thermal efficiency. The 6-speed manual transmission was standard, providing a direct connection to the engine’s power. The engine was longitudinally mounted, driving the rear wheels, a configuration consistent with traditional Mercedes-Benz performance models.

Driving Characteristics

The CLK 320 CDI offered a distinctly different driving experience compared to its gasoline-powered siblings. While lacking the outright acceleration of the CLK 500, the 320 CDI excelled in providing a broad, usable powerband. The 415 Nm (306 lb-ft) of torque, available from a low 1400 rpm, resulted in strong mid-range acceleration and effortless cruising. The 6-speed manual transmission allowed for precise control, although the gear ratios were tuned more for fuel efficiency than outright performance. Compared to the 1.8L Kompressor models, the 320 CDI felt significantly more powerful and refined. The diesel engine’s weight, however, did contribute to a slightly less nimble feel in corners.

Equipment & Trim Levels

The CLK 320 CDI typically came well-equipped, reflecting its position as a mid-range offering. Standard features included automatic climate control, power windows and mirrors, a multi-function steering wheel, and a high-quality audio system. Interior upholstery was typically a combination of leather and fabric, with options for full leather available. Common optional extras included a sunroof, navigation system, heated seats, and upgraded audio systems. The dashboard layout was typical of Mercedes-Benz at the time, emphasizing a luxurious and understated aesthetic.

Chassis & Braking

The CLK 320 CDI utilized an independent suspension system at all four wheels. The front suspension employed a McPherson strut design with a transverse stabilizer bar, while the rear featured a multi-link setup, also with a stabilizer bar. This configuration provided a comfortable ride while maintaining reasonable handling characteristics. Braking duties were handled by ventilated discs at the front and solid discs at the rear, equipped with ABS (Anti-lock Braking System) as standard. The steering was a rack and pinion system with hydraulic power assistance, offering a balanced feel and precise control.

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 more expensive and less fuel-efficient CLK 500. Compared to the smaller-engined CLK models, the 320 CDI offered a significant step up in performance and driving enjoyment. Fuel economy was a key selling point, with combined figures ranging from 7.1 to 7.3 liters per 100 kilometers (33.1 – 32.2 US mpg). Reliability was generally good, although diesel particulate filter (DPF) issues could arise with infrequent long-distance driving.

Legacy

The CLK 320 CDI, and the OM642 engine it featured, have proven to be relatively durable and reliable powertrains. While maintenance costs for diesel engines can be higher than for gasoline engines, the OM642 is known for its longevity when properly maintained. In the used car market, the CLK 320 CDI remains a desirable option for buyers seeking a stylish and economical convertible or coupe. The combination of Mercedes-Benz prestige, diesel efficiency, and a comfortable driving experience continues to appeal to a wide range of buyers. However, potential buyers should be aware of the potential for DPF issues and the importance of regular maintenance to ensure long-term reliability.