The Mercedes-Benz R-Class Long (V251) R 350 V6 4MATIC G-TRONIC, produced from 2006 to 2010, represented a unique offering in the luxury vehicle segment. Positioned as a spacious, versatile crossover, the R-Class aimed to blend the comfort of a luxury sedan with the practicality of an SUV. The “Long” designation indicates an extended wheelbase version, primarily sold in markets outside of North America, offering increased rear passenger space. This particular R 350 variant, equipped with a 3.5-liter V6 engine and a seven-speed automatic transmission, served as a mid-range option within the R-Class lineup, offering a balance between performance and fuel efficiency. It was designed to appeal to families and individuals needing substantial cargo capacity and all-weather capability.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | R-Class |
| Generation | R-Class Long (V251) |
| Type (Engine) | R 350 V6 (272 Hp) 4MATIC G-TRONIC |
| Start of production | 2006 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (combined) | 11.7 l/100 km (20.1 US mpg, 24.1 UK mpg, 8.5 km/l) |
| CO2 emissions | 274 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.4 sec |
| Acceleration 0 – 62 mph | 8.4 sec |
| Acceleration 0 – 60 mph | 8 sec |
| Maximum speed | 230 km/h (142.92 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 8.2 kg/Hp, 122 Hp/tonne |
| Weight-to-torque ratio | 6.4 kg/Nm, 157 Nm/tonne |
| Power | 272 Hp @ 6000 rpm |
| Power per litre | 77.8 Hp/l |
| Torque | 350 Nm @ 2400-5000 rpm (258.15 lb.-ft. @ 2400-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 272.967 |
| 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 | 10.7:1 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 10.1 l (10.67 US qt | 8.89 UK qt) |
| Kerb Weight | 2230 kg (4916.31 lbs.) |
| Max. weight | 2880 kg (6349.31 lbs.) |
| Max load | 650 kg (1433 lbs.) |
| Trunk (boot) space – maximum | 3215 l (113.54 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 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.) |
| Height | 1674 mm (65.91 in.) |
| Wheelbase | 3215 mm (126.57 in.) |
| Front track | 1661 mm (65.39 in.) |
| Rear (Back) track | 1651 mm (65 in.) |
| Minimum turning circle | 12.4 m (40.68 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 7 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 235/65 R17 |
| Wheel rims size | 17 |
Powertrain & Engine Architecture
The heart of the R 350 was the M 272.967 3.5-liter naturally aspirated V6 engine. This engine featured a 60-degree V-angle, aluminum alloy block and cylinder heads, and dual overhead camshafts (DOHC) with four valves per cylinder. The M272 engine family was known for its smooth operation and relatively high power output for its displacement. Fuel delivery was handled by a multi-port fuel injection system, providing precise fuel metering for optimal combustion. The engine produced 272 horsepower at 6,000 rpm and 350 Nm (258 lb-ft) of torque between 2,400 and 5,000 rpm. This power was channeled through Mercedes-Benz’s 7G-TRONIC seven-speed automatic transmission, a sophisticated unit known for its smooth shifts and wide gear ratio spread. The 7G-TRONIC allowed for both relaxed cruising and responsive acceleration. The 4MATIC all-wheel-drive system distributed power to all four wheels, enhancing traction and stability in various driving conditions.
Driving Characteristics
The R 350 V6 4MATIC offered a comfortable and composed driving experience. While not a sports car, the engine provided adequate power for everyday driving and highway passing maneuvers. The seven-speed automatic transmission contributed to smooth acceleration and helped to keep the engine in its optimal power band. The 0-60 mph time of around 8 seconds was respectable for a large, luxury crossover. The all-wheel-drive system provided confident handling in inclement weather. Compared to the more powerful R 500 V8, the R 350 offered a more fuel-efficient option, albeit with less outright performance. Compared to the diesel-powered R 320 CDI, the R 350 provided a more traditional gasoline engine feel, with a quicker-revving nature but lower torque at lower engine speeds.
Equipment & Trim Levels
The R 350 typically came well-equipped with standard features such as leather upholstery, dual-zone automatic climate control, a premium audio system, and power-adjustable front seats. Optional extras included a rear-seat entertainment system, navigation system, panoramic sunroof, and advanced safety features like Distronic adaptive cruise control. Trim levels varied by market, but generally, the R 350 occupied a mid-range position, offering a good balance of luxury and features without the higher price tag of the top-tier R 500. Interior materials were of high quality, reflecting Mercedes-Benz’s commitment to luxury.
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 design, while the rear employed an independent multi-link setup with a stabilizer bar. This configuration aimed to minimize body roll and provide precise handling. Braking duties were handled by ventilated discs at the front and solid discs at the rear, coupled with an Anti-lock Braking System (ABS) for enhanced stopping power and control. The hydraulic power steering provided a responsive and precise steering feel.
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 V6 was often seen as the most sensible choice in the lineup, offering a good balance of performance, fuel economy, and price. Fuel economy was rated at around 20 mpg combined, which was reasonable for a vehicle of its size and class. Reliability was generally good, although some owners reported issues with the electronic systems. Compared to competitors like the Acura MDX and BMW X5, the R-Class offered a unique blend of luxury and practicality, but its polarizing styling limited its appeal.
Legacy
The Mercedes-Benz R-Class, while not a commercial blockbuster, remains a distinctive vehicle in the luxury crossover segment. The M 272 V6 engine proved to be a reliable and durable powerplant, and examples of the R 350 are still found on the used car market today. While maintenance costs can be higher than some competitors due to the Mercedes-Benz brand, the R 350 offers a comfortable and spacious driving experience for those seeking a versatile and luxurious vehicle. Its unique design and spacious interior continue to appeal to a niche group of buyers who appreciate its unconventional character.
