The Mercedes-Benz R-Class (W251) R 350 V6 4MATIC G-TRONIC, produced from 2006 to 2010, represents a unique offering in Mercedes-Benz’s lineup. Positioned as a luxury crossover between a traditional SUV and a station wagon, the R-Class aimed to provide the space and versatility of a larger vehicle with the driving dynamics of a passenger car. The R 350 variant, equipped with the M272 V6 engine and a 7G-TRONIC automatic transmission, served as a mid-range option within the R-Class family, offering a balance of performance and fuel efficiency. It was primarily marketed towards families and individuals seeking a comfortable and capable vehicle for long journeys and everyday use, particularly in markets where larger vehicles were favored.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | R-class |
| Generation | R-class (W251) |
| 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 (urban) | 15.5-15.7 l/100 km (15.2 – 15 US mpg, 18.2 – 18 UK mpg, 6.5 – 6.4 km/l) |
| Fuel consumption (extra urban) | 9.0-9.2 l/100 km (26.1 – 25.6 US mpg, 31.4 – 30.7 UK mpg, 11.1 – 10.9 km/l) |
| Fuel consumption (combined) | 11.4-11.6 l/100 km (20.6 – 20.3 US mpg, 24.8 – 24.4 UK mpg, 8.8 – 8.6 km/l) |
| CO2 emissions | 271 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.3 sec |
| Acceleration 0 – 62 mph | 8.3 sec |
| Acceleration 0 – 60 mph | 7.9 sec |
| Maximum speed | 230 km/h (142.92 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 8 kg/Hp, 124.8 Hp/tonne |
| Weight-to-torque ratio | 6.2 kg/Nm, 160.6 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 | 2180 kg (4806.08 lbs.) |
| Max. weight | 2810 kg (6194.99 lbs.) |
| Max load | 630 kg (1388.91 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 with brakes (12%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4922 mm (193.78 in.) |
| Width | 1922 mm (75.67 in.) |
| Height | 1674 mm (65.91 in.) |
| Wheelbase | 2980 mm (117.32 in.) |
| Front track | 1661 mm (65.39 in.) |
| Rear (Back) track | 1651 mm (65 in.) |
| Minimum turning circle | 11.8 m (38.71 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 R 350’s heart is the M272.967 3.5-liter naturally aspirated V6 engine. This engine, a staple in many Mercedes-Benz vehicles of the era, features a three-valve per cylinder design (two intake, one exhaust) and utilizes multi-port fuel injection. The M272 is known for its smooth operation and relatively high power output for its displacement. The engine produces 272 horsepower at 6000 rpm and 350 Nm (258 lb-ft) of torque between 2400 and 5000 rpm. Paired with the engine is the 7G-TRONIC automatic transmission, a seven-speed unit that offered smooth and efficient gear changes. This transmission contributed to the R 350’s refined driving experience and helped to manage fuel consumption. The 4MATIC all-wheel-drive system distributes power to all four wheels, enhancing traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The R 350 V6 4MATIC delivers a comfortable and composed driving experience. While not overtly sporty, the engine provides adequate power for everyday driving and highway cruising. Acceleration from 0 to 60 mph takes approximately 7.9 seconds, and the vehicle has a top speed of 143 mph. The 7G-TRONIC transmission is well-tuned, offering seamless shifts and contributing to a relaxed driving feel. Compared to the more powerful R 500 V8 model, the R 350 offers less outright performance but provides better fuel economy. Against the diesel-powered R 320 CDI, the R 350 trades fuel efficiency for a smoother, quieter engine character. The all-wheel-drive system provides confident handling in various conditions, making it a capable all-weather vehicle.
Equipment & Trim Levels
The R 350 typically came standard with a generous array of features, including leather upholstery, dual-zone automatic climate control, a premium sound system, and power-adjustable front seats. Optional extras included a rear-seat entertainment system, a panoramic sunroof, and advanced driver-assistance features like Distronic adaptive cruise control. Interior trim options varied, allowing buyers to customize the cabin to their preferences. The dashboard layout is typical of Mercedes-Benz of the period, with a focus on elegance and functionality. The R-Class was designed to offer a luxurious and comfortable interior, befitting its premium positioning.
Chassis & Braking
The R-Class utilizes a robust chassis with a double wishbone front suspension and an independent multi-link rear suspension, both incorporating a stabilizer bar. This suspension setup provides a comfortable ride while maintaining good handling characteristics. The R 350 is equipped with ventilated disc brakes at the front and solid disc brakes at the rear. The anti-lock braking system (ABS) is standard, enhancing braking performance and stability. The steering is a hydraulic power-assisted rack and pinion system, providing precise and responsive steering feel.
Market Reception & Comparison
The R-Class, in general, received mixed reviews upon its launch. Critics praised its spacious interior and comfortable ride but questioned its unconventional styling and somewhat awkward proportions. The R 350 variant was generally viewed as a sensible choice for buyers prioritizing fuel efficiency and a smooth driving experience. Compared to the R 500, the R 350 offered a more affordable entry point into the R-Class range. Fuel economy, while not exceptional, was better than the V8 model, averaging around 20-24 mpg in combined driving. Reliability reports suggest that the M272 engine is generally durable, but preventative maintenance is crucial to avoid potential issues with the timing chain tensioners.
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 4MATIC G-TRONIC, with its smooth engine and comfortable ride, has developed a following among enthusiasts who appreciate its versatility and luxury. On the used car market, well-maintained examples of the R 350 can be found at relatively affordable prices. The M272 engine, while requiring regular maintenance, is known for its longevity, making the R 350 a potentially reliable choice for buyers seeking a spacious and comfortable crossover.
