2008-2009 Mercedes-Benz CLS coupe (C219 facellift ) CLS 320 CDI V6 (224 Hp) 7G-TRONIC

The Mercedes-Benz CLS 320 CDI, produced from January 2008 to April 2009, represents a compelling blend of luxury, performance, and diesel efficiency within the C219 CLS-Class coupe range. Positioned as a mid-range offering, it slotted between the entry-level CLS 280 CDI and the higher-performance CLS 550 models. This variant was primarily aimed at European markets, where diesel engines held significant popularity due to their fuel economy and torque characteristics. The facelifted C219 generation, introduced in 2008, brought revised styling cues and updated technology to the four-door coupe format, solidifying the CLS’s position as a style leader.

Powertrain & Engine Architecture

The CLS 320 CDI is powered by the OM 642.920 3.0-liter V6 diesel engine. This engine is a hallmark of Mercedes-Benz’s diesel technology, featuring common-rail direct injection and a variable geometry turbocharger. The common-rail system, operating at extremely high pressures, ensures precise fuel delivery and optimized combustion. The V6 configuration provides inherent smoothness and balance, minimizing vibrations typically associated with diesel engines. The engine produces 224 horsepower at 3800 rpm and a substantial 540 Nm (398 lb-ft) of torque between 1600 and 2400 rpm. This broad torque curve is a key characteristic of the engine, providing strong acceleration and effortless cruising. The engine utilizes a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, further enhancing its breathing and efficiency. The 7G-TRONIC seven-speed automatic transmission, standard on this model, is known for its smooth and responsive shifts. It contributes to both fuel efficiency and performance, offering a wide range of gear ratios to suit various driving conditions.

Driving Characteristics

The CLS 320 CDI with the 7G-TRONIC transmission delivers a refined and comfortable driving experience. The abundant torque allows for brisk acceleration, with a 0-60 mph time of around 6.7 seconds. While not as overtly sporty as the gasoline-powered CLS variants, the 320 CDI offers ample power for overtaking and highway cruising. The 7G-TRONIC transmission is programmed for smooth shifts, prioritizing comfort over aggressive gear changes. Compared to the manual transmission options available on other CLS models, the automatic provides a more relaxed driving experience, particularly in urban traffic. The relatively high weight of the vehicle (1740 kg / 3836 lbs) is noticeable, but the strong torque output mitigates this to a degree. The rear-wheel drive configuration provides a balanced feel, although it can be less forgiving in slippery conditions compared to all-wheel drive systems.

Equipment & Trim Levels

The CLS 320 CDI typically came well-equipped as standard. Common features included leather upholstery, automatic climate control, a premium audio system, and power-adjustable front seats. The interior design mirrored the luxurious aesthetic of the CLS range, with high-quality materials and a focus on comfort. Optional extras included a panoramic sunroof, upgraded audio systems (such as Harman Kardon), and various driver-assistance features like Distronic adaptive cruise control and parking assist. Trim levels were relatively limited, with most customization occurring through the selection of individual options. Wood trim was a common interior accent, and buyers could choose from a range of exterior colors.

Chassis & Braking

The CLS 320 CDI utilizes a sophisticated suspension system designed to balance comfort and handling. The front suspension features a multi-link independent setup with coil springs and a transverse stabilizer bar. The rear suspension also employs a multi-link independent design, with coil springs and a stabilizer bar. Air suspension was available as an optional extra, providing an even more refined ride quality and the ability to adjust ride height. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) is standard, enhancing safety and stability during emergency braking. The steering is a hydraulic power-assisted rack and pinion system, offering precise and responsive control.

Market Reception & Comparison

The CLS 320 CDI was generally well-received by automotive critics, who praised its blend of luxury, performance, and fuel efficiency. The diesel engine was lauded for its smooth operation and strong torque output. However, some reviewers noted that the ride could be firm, particularly with the sport suspension options. Compared to the CLS 280 CDI, the 320 CDI offered a significant performance upgrade, while remaining more fuel-efficient than the larger-displacement gasoline engines. Against competitors like the BMW 5 Series Touring and Audi A6 Avant, the CLS 320 CDI stood out with its unique four-door coupe styling and luxurious interior. Fuel economy figures of 7.6-8.1 l/100 km (30.9-29 US mpg) were competitive for its class.

Legacy

The OM 642 engine family, including the version used in the CLS 320 CDI, has proven to be remarkably durable and reliable. With proper maintenance, these engines can easily exceed 200,000 miles. The 7G-TRONIC transmission is also generally reliable, although it may require fluid changes and occasional servicing. In the used car market, the CLS 320 CDI represents a good value proposition, offering a luxurious and well-equipped coupe at a relatively affordable price. However, potential buyers should be aware of the potential for diesel particulate filter (DPF) issues, particularly if the vehicle has been primarily used for short trips. Overall, the CLS 320 CDI remains a desirable and capable grand tourer, offering a unique combination of style, comfort, and efficiency.