2009-2010 Mercedes-Benz R-class Long (V251) R 320 BlueTec (210 Hp) G-TRONIC

The Mercedes-Benz R-Class Long (V251) R 320 BlueTec G-TRONIC, produced from 2009 to 2010, represented a unique offering within the luxury SUV/wagon segment. Positioned as a spacious, comfortable, and technologically advanced vehicle, the R 320 BlueTec aimed to bridge the gap between traditional SUVs and more conventional station wagons. The “Long” designation indicates an extended wheelbase version, primarily sold in markets desiring increased rear passenger space. This variant, equipped with the OM642 diesel engine and the 7G-TRONIC automatic transmission, was a mid-to-upper trim level, offering a balance of performance, efficiency, and luxury features. It was primarily marketed in Europe and other regions where larger, multi-purpose vehicles were popular.

Technical Specifications

INTRODUCTION

The R 320 BlueTec G-TRONIC, launched in 2009 as part of the V251 R-Class facelift, was designed to appeal to buyers seeking a luxurious and versatile vehicle. The V251 generation, introduced in 2005, aimed to create a new vehicle category – a “Grand Sport Tourer” – blending the space and practicality of an SUV with the driving dynamics of a sedan. The “Long” wheelbase version, offered primarily outside of North America, provided enhanced rear legroom, making it suitable for families or chauffeur-driven applications. The R 320 BlueTec, with its powerful diesel engine and smooth-shifting automatic transmission, represented a sophisticated option within the R-Class range.

Powertrain & Engine Architecture

At the heart of the R 320 BlueTec lies the OM642 3.0-liter V6 diesel engine. This engine, a mainstay of the Mercedes-Benz lineup, is renowned for its durability and torque output. The “BlueTec” designation signifies the inclusion of advanced emissions control technology, including a particulate filter and a selective catalytic reduction (SCR) system utilizing AdBlue (Diesel Exhaust Fluid) to reduce nitrogen oxide (NOx) emissions, ensuring compliance with stringent Euro 5 standards. The engine employs a common rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. It features four valves per cylinder and a single turbocharger with an intercooler, boosting power and efficiency. The 7G-TRONIC automatic transmission, a seven-speed unit, provides smooth and responsive gear changes. This transmission is known for its efficiency and ability to adapt to driving conditions.

Driving Characteristics

The R 320 BlueTec offered a refined and comfortable driving experience. The 540 Nm (398 lb-ft) of torque, available from a low 1600 rpm, provided strong acceleration and effortless cruising. While not a sports car, the R 320 BlueTec could reach 0-60 mph in approximately 8.5 seconds and achieve a top speed of 134 mph. The 7G-TRONIC transmission contributed to a relaxed driving experience, seamlessly shifting gears to maintain optimal engine speed. Compared to the gasoline-powered R 350, the R 320 BlueTec offered superior fuel economy and a more relaxed power delivery. It also provided a significant torque advantage over the smaller R 280 CDI, making it more suitable for towing or carrying heavy loads. The rear-wheel-drive configuration provided a balanced feel, although it lacked the all-wheel-drive capability of some other R-Class variants.

Equipment & Trim Levels

The R 320 BlueTec typically came well-equipped with standard features including leather upholstery, automatic climate control, a premium audio system, and power-adjustable front seats. The long wheelbase model prioritized rear passenger comfort, often including features like rear seat entertainment options and individual climate controls. Optional extras included a panoramic sunroof, adaptive cruise control, parking assist, and upgraded interior trim materials. The overall interior design emphasized luxury and functionality, with a focus on creating a spacious and comfortable environment for all occupants.

Chassis & Braking

The R-Class Long featured a robust chassis designed to handle the vehicle’s weight and provide a comfortable ride. The front suspension utilized a double wishbone setup, while the rear employed an independent multi-link spring suspension with a stabilizer bar. This configuration aimed to balance ride comfort with handling stability. The R 320 BlueTec was equipped with disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) was standard, enhancing safety and control during emergency braking situations. The hydraulic power steering offered precise and responsive steering feel.

Market Reception & Comparison

The Mercedes-Benz R-Class, in general, faced a lukewarm reception in the market. Its unconventional styling and positioning – not quite an SUV, not quite a wagon – proved challenging for consumers to categorize. Critics praised the R 320 BlueTec’s powerful and efficient diesel engine, comfortable ride, and spacious interior. However, some found the handling to be somewhat cumbersome due to the vehicle’s size and weight. Compared to other luxury SUVs of the time, such as the BMW X5 and Porsche Cayenne, the R-Class offered a different proposition, prioritizing space and comfort over outright performance. The R 320 BlueTec’s fuel economy was a strong point, exceeding that of many gasoline-powered competitors.

Legacy

The OM642 engine, found in the R 320 BlueTec, is known for its longevity and reliability when properly maintained. While the R-Class itself didn’t achieve widespread popularity, the OM642 engine has a strong reputation among diesel enthusiasts. Today, used examples of the R 320 BlueTec can be found at relatively affordable prices. Potential buyers should be aware of the maintenance requirements of a diesel engine, including regular servicing of the fuel injection system and the AdBlue system. The R 320 BlueTec represents a unique and somewhat overlooked chapter in Mercedes-Benz history, offering a blend of luxury, space, and diesel efficiency that remains appealing to a niche group of buyers.