The Mercedes-Benz R-Class Long (V251 series, post-facelift introduced in 2010) R 350 CDI V6 4MATIC G-TRONIC represents a unique offering within the luxury SUV/wagon segment. Produced from 2010 to 2014, this variant aimed to bridge the gap between traditional SUVs and station wagons, offering seating for up to seven passengers in a relatively spacious and comfortable environment. The “Long” designation indicates an extended wheelbase compared to the standard R-Class, providing increased rear passenger legroom and cargo capacity. This model was primarily marketed in Europe and other international markets, with limited availability in the United States.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | R-Class |
| Generation | R-Class Long (V251, facelift 2010) |
| Type (Engine) | R 350 CDI V6 (265 Hp) 4MATIC G-TRONIC |
| Start of production | 2010 |
| End of production | 2014 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5-7 |
| Doors | 5 |
| Fuel consumption (urban) | 11 l/100 km (21.4 US mpg) |
| Fuel consumption (extra urban) | 7 l/100 km (33.6 US mpg) |
| Fuel consumption (combined) | 8.5 l/100 km (27.7 US mpg) |
| CO2 emissions | 223 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.6 sec |
| Acceleration 0 – 62 mph | 7.6 sec |
| Acceleration 0 – 60 mph | 7.2 sec |
| Maximum speed | 235 km/h (146.02 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 8.4 kg/Hp |
| Weight-to-torque ratio | 3.6 kg/Nm |
| Power | 265 Hp @ 3800 rpm |
| Torque | 620 Nm @ 1600-2400 rpm (457.29 lb.-ft. @ 1600-2400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.872 |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Compression ratio | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant capacity | 9.5 l (10.04 US qt | 8.36 UK qt) |
| Kerb Weight | 2220 kg (4894.26 lbs.) |
| Max. weight | 2910 kg (6415.45 lbs.) |
| Max load | 690 kg (1521.19 lbs.) |
| Trunk (boot) space – minimum | 633 l (22.35 cu. ft.) |
| Trunk (boot) space – maximum | 2385 l (84.23 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Permitted trailer load with brakes (12%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 5157 mm (203.03 in.) |
| Width | 1922 mm (75.67 in.) |
| Width including mirrors | 2183 mm (85.94 in.) |
| Height | 1674 mm (65.91 in.) |
| Wheelbase | 3215 mm (126.57 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.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 7 gears, automatic transmission G-TRONIC |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Tires size | 255/55 R18 |
| Wheel rims size | 18 |
Powertrain & Engine Architecture
The R 350 CDI V6 is powered by the OM 642.872 engine, a 3.0-liter turbocharged diesel V6. This engine is a cornerstone of Mercedes-Benz’s diesel offerings, known for its robust construction and relatively high output. The OM 642 features a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The engine utilizes four valves per cylinder and a variable geometry turbocharger with an intercooler to enhance both power and efficiency. The 7G-TRONIC automatic transmission, a seven-speed unit, was standard. This transmission is known for its smooth shifting and ability to adapt to driving conditions, contributing to both performance and fuel economy. The 4MATIC all-wheel-drive system provides enhanced traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The R 350 CDI V6 Automatic offered a comfortable and refined driving experience. While not a sports car, the engine’s 620 Nm (457 lb-ft) of torque provided ample power for effortless cruising and confident overtaking. The 7G-TRONIC transmission contributed to smooth gear changes, minimizing disruptions during acceleration. Compared to the R 300 CDI (with a lower-powered diesel engine) or the gasoline-powered R 350, the R 350 CDI offered significantly more performance. The automatic transmission, while convenient, did result in slightly slower acceleration times compared to the available six-speed manual transmission, but the difference was generally not noticeable in everyday driving. The 4MATIC system provided a secure feel on various road surfaces.
Equipment & Trim Levels
The R-Class Long, even in the R 350 CDI 4MATIC G-TRONIC trim, offered a generous level of standard equipment. This included leather upholstery, automatic climate control, a premium audio system, and a host of safety features like ABS, ESP, and multiple airbags. Optional extras included a panoramic sunroof, navigation system, adaptive cruise control, and parking assist. Interior trim options varied, allowing buyers to personalize the vehicle to their preferences. The long wheelbase version prioritized rear passenger comfort, often equipped with individual rear seats and entertainment options.
Chassis & Braking
The R-Class utilized a double wishbone front suspension and an independent multi-link rear suspension, providing a comfortable ride quality. Stabilizer bars were fitted front and rear to reduce body roll during cornering. The braking system consisted of ventilated disc brakes on all four wheels, providing ample stopping power. The 4MATIC all-wheel-drive system distributed power between the front and rear axles as needed, enhancing traction and stability. The suspension was tuned for comfort rather than outright sportiness, reflecting the vehicle’s intended role as a luxurious and practical family vehicle.
Market Reception & Comparison
The Mercedes-Benz R-Class, despite its innovative design, faced lukewarm reception in many markets. Critics often found its styling polarizing and its positioning somewhat unclear – it wasn’t quite an SUV, nor a traditional station wagon. The R 350 CDI V6 4MATIC G-TRONIC was generally praised for its powerful engine, comfortable ride, and refined interior. However, its relatively high price point and complex engineering contributed to higher maintenance costs compared to some competitors. Compared to the R 300 CDI, the R 350 CDI offered a noticeable performance upgrade, but at a higher price. Fuel economy was competitive for its class, but the diesel particulate filter required periodic maintenance.
Legacy
The Mercedes-Benz R-Class, while not a commercial success, remains a unique and interesting vehicle. The OM 642 diesel engine, in particular, is known for its durability and reliability, provided it receives regular maintenance. The 7G-TRONIC transmission is also generally considered a robust unit. Today, well-maintained R 350 CDI models can be found on the used car market at relatively affordable prices. However, potential buyers should be aware of the potential for higher maintenance costs associated with its complex systems and the need to ensure the diesel particulate filter is functioning correctly. The R-Class represents a bold attempt by Mercedes-Benz to redefine the luxury vehicle segment, and its legacy lies in its innovative design and engineering.
