The Mercedes-Benz R-Class R 350 V6 BlueEFFICIENCY 4MATIC, produced from September 2011 to 2013, represents a unique offering within the W251 R-Class generation, which received a significant facelift in 2010. Positioned as a mid-to-upper trim level, this variant aimed to blend luxury, space, and reasonable fuel efficiency within the framework of a large, versatile station wagon. It was primarily marketed in Europe and North America as an alternative to traditional SUVs and minivans, offering seating for up to seven passengers and a more car-like driving experience. The “BlueEFFICIENCY” designation indicated Mercedes-Benz’s efforts to improve fuel economy through various technological enhancements.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | R-Class |
| Generation | R-Class (W251, facelift 2010) |
| Type | R 350 V6 BlueEFFICIENCY (306 Hp) 4MATIC 7G-TRONIC PLUS |
| Start of production | September, 2011 |
| End of production | 2013 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5-7 |
| Doors | 5 |
| Fuel consumption (urban) | 13.2-13.3 l/100 km (17.8 – 17.7 US mpg, 21.4 – 21.2 UK mpg, 7.6 – 7.5 km/l) |
| Fuel consumption (extra urban) | 8.1-8.2 l/100 km (29 – 28.7 US mpg, 34.9 – 34.4 UK mpg, 12.3 – 12.2 km/l) |
| Fuel consumption (combined) | 10-10.1 l/100 km (23.5 – 23.3 US mpg, 28.2 – 28 UK mpg, 10 – 9.9 km/l) |
| CO2 emissions | 233-235 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.8 sec |
| Acceleration 0 – 62 mph | 7.8 sec |
| Acceleration 0 – 60 mph | 7.4 sec |
| Maximum speed | 245 km/h (152.24 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 6.9 kg/Hp, 145.4 Hp/tonne |
| Weight-to-torque ratio | 5.7 kg/Nm, 175.8 Nm/tonne |
| Power | 306 Hp @ 6500 rpm |
| Torque | 370 Nm @ 3500-5250 rpm (272.9 lb.-ft. @ 3500-5250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 276.958 |
| Engine displacement | 3498 cm3 (213.46 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 92.9 mm (3.66 in.) |
| Piston Stroke | 86 mm (3.39 in.) |
| Compression ratio | 12:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 7.5 l (7.93 US qt | 6.6 UK qt) |
| Kerb Weight | 2105-2150 kg (4640.73 – 4739.94 lbs.) |
| Max. weight | 2840-2950 kg (6261.13 – 6503.64 lbs.) |
| Max load | 735-800 kg (1620.4 – 1763.7 lbs.) |
| Trunk (boot) space (minimum) | 550 l (19.42 cu. ft.) |
| Trunk (boot) space (maximum) | 1950 l (68.86 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load (braked) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load (unbraked) | 750 kg (1653.47 lbs.) |
| Length | 4922 mm (193.78 in.) |
| Width | 1922 mm (75.67 in.) |
| Width including mirrors | 2183 mm (85.94 in.) |
| Height | 1674 mm (65.91 in.) |
| Wheelbase | 2980 mm (117.32 in.) |
| Front track | 1661 mm (65.39 in.) |
| Rear track | 1651 mm (65 in.) |
| Front overhang | 922 mm (36.3 in.) |
| Rear overhang | 1020 mm (40.16 in.) |
| Minimum turning circle | 11.8 m (38.71 ft.) |
| Drivetrain Architecture | All wheel drive (4×4). Internal Combustion engine. |
| Number of gears | 7 |
| Gearbox type | Automatic transmission G-TRONIC PLUS |
| Front suspension | Coil spring, Double wishbone, Transverse stabilizer |
| Rear suspension | Independent multi-link spring suspension with stabilizer, Air Suspension – Optional |
| Front brakes | Ventilated discs, 330 mm |
| Rear brakes | Ventilated discs, 330 mm |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 255/55 R18 |
| Wheel rims size | 8J x 18 |
Powertrain & Engine Architecture
The R 350 4MATIC is powered by the M276.958 3.5-liter naturally aspirated V6 engine. This engine is a member of Mercedes-Benz’s modular engine family, known for its smooth operation and relatively high power output. It features a 60-degree V-angle, aluminum alloy block and cylinder heads, and a silicon-aluminum alloy for the pistons. The engine utilizes direct fuel injection, delivering fuel directly into the combustion chamber for improved efficiency and performance. The valvetrain employs double overhead camshafts (DOHC) with four valves per cylinder, optimizing airflow for increased power. The engine produces 306 horsepower at 6500 rpm and 370 Nm (272.9 lb-ft) of torque between 3500 and 5250 rpm. This power is delivered to all four wheels via Mercedes-Benz’s 7G-TRONIC PLUS seven-speed automatic transmission. This transmission is known for its smooth shifting and efficiency, offering both manual and automatic shift modes. The 7G-TRONIC PLUS features a torque converter lock-up clutch to reduce slippage and improve fuel economy at cruising speeds.
Driving Characteristics
The R 350 4MATIC offers a comfortable and refined driving experience. While not a sports car, the 306 hp V6 provides adequate power for everyday driving and highway passing. The 7G-TRONIC PLUS transmission contributes to smooth acceleration and seamless gear changes. Compared to the R 350’s manual transmission counterparts (available in some markets), the automatic prioritizes comfort and ease of use over outright performance. The 4MATIC all-wheel-drive system provides enhanced traction and stability, particularly in inclement weather. The gear ratios are tuned for a balance between acceleration and fuel efficiency, with a relatively tall final drive ratio. The R-Class, due to its size and weight, doesn’t feel particularly agile, but the suspension provides a comfortable ride, absorbing bumps and imperfections in the road surface effectively.
Equipment & Trim Levels
The R 350 4MATIC BlueEFFICIENCY typically came standard with a comprehensive list of features, including leather upholstery, power-adjustable front seats with memory function, dual-zone automatic climate control, a premium audio system, and a navigation system. Standard safety features included ABS, traction control, stability control, and multiple airbags. Optional extras included a panoramic sunroof, rear seat entertainment system, adaptive cruise control, and parking assist. Interior trim options varied, with choices in wood veneers and aluminum accents. The R-Class offered a configurable seating arrangement, allowing owners to choose between five or seven seats depending on their needs.
Chassis & Braking
The R-Class utilizes a robust chassis designed to handle the vehicle’s weight and provide a comfortable ride. The front suspension features coil springs and a double wishbone setup with a transverse stabilizer bar. The rear suspension is an independent multi-link design, also with a stabilizer bar. Air suspension was available as an option, providing adjustable ride height and further enhancing ride comfort. The braking system consists of ventilated discs on all four wheels, measuring 330mm in diameter. ABS (Anti-lock Braking System) is standard, ensuring optimal braking performance in various conditions. The steering system is a rack-and-pinion setup with hydraulic power assistance.
Market Reception & Comparison
The R-Class, in general, received mixed reviews. Critics praised its spacious interior, comfortable ride, and available features, but often criticized its unconventional styling and relatively high price point. The R 350 4MATIC, specifically, was seen as a good compromise between performance and fuel economy within the R-Class lineup. Compared to the R 280 CDI (diesel) models, the R 350 offered a smoother and quieter driving experience, but with lower fuel economy. Compared to the more powerful R 500 V8, the R 350 was more affordable and fuel-efficient, but lacked the V8’s outright performance. Reliability reports suggest that the M276 engine is generally robust, but routine maintenance is crucial to prevent issues.
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 BlueEFFICIENCY 4MATIC, with its blend of luxury, space, and technology, has found a niche following among enthusiasts who appreciate its versatility and refinement. On the used car market, these models are generally well-maintained and offer a good value proposition for buyers seeking a spacious and comfortable vehicle. The M276 engine has proven to be relatively reliable, but regular maintenance, including oil changes and timing chain inspections, is essential to ensure long-term durability. The R-Class represents a bold attempt by Mercedes-Benz to redefine the luxury vehicle segment, and its legacy continues to be appreciated by those who recognize its unique qualities.
