2009-2010 Mercedes-Benz R-class (W251) R 350 CDI V6 (224 Hp) 4MATIC G-TRONIC

The Mercedes-Benz R-Class (W251) R 350 CDI V6 4MATIC G-TRONIC, produced from 2009 to 2010, represents a unique offering within the luxury SUV/wagon segment. Positioned as a spacious, versatile vehicle, the R-Class aimed to blend the practicality of a sport tourer with the prestige and refinement expected of a Mercedes-Benz. This particular variant, powered by the OM 642.950 3.0-liter V6 turbodiesel engine and paired with the 7G-TRONIC automatic transmission, was a key model in the R-Class lineup, offering a balance of performance, fuel efficiency, and all-weather capability thanks to its 4MATIC all-wheel-drive system. It was sold primarily in Europe and other markets where larger wagons and SUVs were popular, though it saw limited sales in the United States.

Technical Specifications

INTRODUCTION

The W251 Mercedes-Benz R-Class, launched in 2005, was a bold attempt to create a new vehicle category – a “sports tourer.” The R 350 CDI V6 4MATIC G-TRONIC, produced from 2009-2010, represented a mid-cycle refresh of the original model. It aimed to offer the space and practicality of a minivan, combined with the driving experience and luxury associated with Mercedes-Benz. The R-Class was built on the same platform (the 1HX0 platform, shared with the W164 M-Class) and offered seating for up to seven passengers. This specific diesel variant was particularly popular in European markets due to favorable taxation and the efficiency of diesel engines.

Powertrain & Engine Architecture

At the heart of the R 350 CDI 4MATIC lies the OM 642.950 3.0-liter V6 turbodiesel engine. This engine is a robust and well-regarded design, featuring a cast iron block and aluminum cylinder heads. It utilizes a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The engine also incorporates a variable geometry turbocharger (VGT) and an intercooler to enhance power and efficiency. The V6 produces 224 horsepower and a substantial 510 Nm (376 lb-ft) of torque. The 7G-TRONIC automatic transmission, a seven-speed unit, was standard. This transmission is known for its smooth shifting and efficiency, contributing to the R 350 CDI’s relatively good fuel economy for a vehicle of its size. The transmission features a torque converter and electronically controlled gear changes.

Driving Characteristics

The R 350 CDI 4MATIC offered a comfortable and refined driving experience. The 3.0-liter V6 provided ample torque, making it capable of accelerating from 0 to 60 mph in around 8.3 seconds. While not a sports car, the engine delivered strong performance for everyday driving and overtaking maneuvers. The 7G-TRONIC transmission contributed to smooth and seamless gear changes, enhancing the overall driving experience. The 4MATIC all-wheel-drive system provided excellent traction in various weather conditions, making it a safe and confident vehicle to drive year-round. Compared to the R 350 gasoline variant, the CDI offered significantly better fuel economy and more low-end torque. It wasn’t as quick as the higher-output R 500, but it provided a more balanced and practical driving experience for many owners.

Equipment & Trim Levels

The R 350 CDI 4MATIC typically came well-equipped with standard features such as leather upholstery, automatic climate control, a premium audio system, and power-adjustable front seats. Optional extras included a sunroof, navigation system, rear-seat entertainment system, and parking assist. Trim levels varied depending on the market, but generally, the R 350 CDI sat in the mid-range of the R-Class lineup, offering a good balance of luxury and features. Interior materials were of high quality, reflecting Mercedes-Benz’s commitment to craftsmanship. The dashboard layout was functional and well-designed, with intuitive controls.

Chassis & Braking

The R-Class utilized a robust chassis with a double wishbone front suspension and an independent multi-link rear suspension. This setup provided a comfortable ride and good handling characteristics. Stabilizer bars were fitted to both the front and rear axles to reduce body roll. The R 350 CDI 4MATIC was equipped with disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESP) were standard safety features. The suspension was tuned to prioritize comfort, but it still offered a reasonably controlled driving experience.

Market Reception & Comparison

The R-Class, in general, received mixed reviews. Critics praised its spacious interior, comfortable ride, and available features, but some found its styling unconventional and its size cumbersome. The R 350 CDI variant was generally well-received for its fuel efficiency and strong torque output. Compared to other luxury SUVs of the time, such as the BMW X5 and Audi Q7, the R-Class offered a unique blend of wagon-like practicality and SUV capability. However, it didn’t achieve the same level of sales success as its competitors. Fuel economy was a strong point, offering around 25 mpg combined, which was competitive for its class.

Legacy

The Mercedes-Benz R-Class was discontinued after the 2013 model year. While it wasn’t a commercial success, it remains a unique and interesting vehicle. The OM 642 engine, in particular, is known for its durability and reliability, provided it is properly maintained. Used R 350 CDI models are relatively affordable and can offer a lot of value for the money. However, potential buyers should be aware of potential maintenance costs associated with a complex vehicle like the R-Class. The R-Class paved the way for the current generation of luxury SUVs with three-row seating, and its innovative design continues to be appreciated by enthusiasts.