2007-2010 Mercedes-Benz R-class (W251) R 350 V6 (272 Hp) G-TRONIC

The Mercedes-Benz R-Class (W251) R 350 V6, produced from 2007 to 2010, represented a unique offering in the luxury vehicle segment. Positioned as a spacious, six or seven-seat vehicle, the R-Class aimed to blend the practicality of a minivan with the driving experience and prestige associated with the Mercedes-Benz brand. The R 350 V6 variant, equipped with the M272 engine and the 7G-TRONIC automatic transmission, served as a mid-range option within the R-Class lineup, offering a balance between performance, fuel economy, and luxury features. It was primarily marketed towards families seeking a versatile and comfortable vehicle for long journeys and everyday use, particularly in markets where larger SUVs and minivans were popular.

Technical Specifications

Powertrain & Engine Architecture

The R 350 V6 was powered by the M272.967 3.5-liter naturally aspirated V6 engine. This engine, a staple in many Mercedes-Benz vehicles of the era, featured a 60-degree V-angle and utilized a three-valve-per-cylinder design (two intake, one exhaust). The engine employed multi-port fuel injection and a relatively high 10.7:1 compression ratio to maximize efficiency and power output. The M272 engine was known for its smooth operation and refined character. Paired with the engine was the 7G-TRONIC seven-speed automatic transmission. This transmission, a significant advancement over previous Mercedes-Benz automatics, offered smoother shifts, improved fuel economy, and a wider range of gear ratios. The 7G-TRONIC featured a torque converter lock-up clutch that engaged in multiple gears, further enhancing efficiency. The drivetrain was configured for rear-wheel drive, providing a more traditional driving experience compared to the available 4MATIC all-wheel-drive system.

Driving Characteristics

The R 350 V6 offered a comfortable and composed driving experience. With 272 horsepower and 350 Nm (258 lb-ft) of torque, acceleration was adequate for most situations, with a 0-60 mph time of around 7.7 seconds. However, it wasn’t a particularly sporty vehicle. The 7G-TRONIC transmission contributed to smooth gear changes, but could sometimes feel hesitant during quick downshifts. Compared to the R 500 V8, the R 350 offered less outright performance, but it provided better fuel economy. Against the diesel-powered R 320 CDI, the R 350 traded the diesel’s superior torque and fuel efficiency for a smoother, quieter engine and potentially lower maintenance costs in the long run. The R 350’s gear ratios were tuned for comfortable cruising, making it well-suited for long highway journeys.

Equipment & Trim Levels

The R 350 V6 typically came standard with a generous array of features, including leather upholstery, power-adjustable front seats, dual-zone automatic climate control, a premium audio system, and a sunroof. Optional extras included a rear-seat entertainment system, navigation, parking sensors, and upgraded leather options. Trim levels varied depending on the market, but generally offered increasing levels of luxury and technology. The base trim provided a comfortable and well-equipped interior, while higher trims added features like wood trim, more advanced audio systems, and additional driver-assistance technologies. The R-Class was designed to be a luxurious and practical vehicle, and the R 350 V6 offered a good balance of both.

Chassis & Braking

The R-Class (W251) utilized a unibody construction, providing a good balance of rigidity and weight. The front suspension featured a double wishbone design, while the rear suspension employed an independent multi-link setup with a stabilizer bar. This suspension configuration aimed to provide a comfortable ride and predictable handling. The R 350 V6 was equipped with ventilated disc brakes at the front and solid discs at the rear. Anti-lock braking system (ABS) was standard, enhancing braking performance and stability. The steering system was a rack-and-pinion setup with hydraulic power assistance, providing precise and responsive steering feel.

Market Reception & Comparison

The Mercedes-Benz R-Class was a polarizing vehicle upon its release. Critics praised its spacious interior, comfortable ride, and luxurious features, but many questioned its unconventional styling and its positioning within the Mercedes-Benz lineup. The R 350 V6 was generally well-received as a sensible and practical option, offering a good balance of performance and fuel economy. However, it often played second fiddle to the more powerful R 500 and the fuel-efficient R 320 CDI in terms of critical acclaim. Fuel economy for the R 350 V6 was reasonable for its size and class, averaging around 21 mpg combined. Reliability was generally good, although some owners reported issues with the electronic systems and the air suspension (if equipped).

Legacy

The Mercedes-Benz R-Class, while not a commercial success in the same vein as other Mercedes-Benz models, remains a unique and interesting vehicle. The R 350 V6 powertrain, while not without its quirks, proved to be relatively reliable and durable. On the used car market, the R 350 V6 represents a relatively affordable entry point into the Mercedes-Benz luxury segment. Well-maintained examples can still provide years of comfortable and reliable service, making them an attractive option for families seeking a spacious and versatile vehicle. The R-Class paved the way for the later GLS-Class, demonstrating Mercedes-Benz’s willingness to experiment with new vehicle concepts and cater to niche markets.