The Mercedes-Benz R-Class (W251) R 280 CDI V6 4MATIC G-TRONIC, produced from 2007 to 2009, represented a unique offering in the luxury vehicle segment. Positioned as a spacious, versatile, and technologically advanced crossover, the R-Class aimed to blend the comfort of a luxury sedan with the practicality of an SUV. The R 280 CDI, equipped with a diesel V6 engine and all-wheel drive, was a significant variant within the W251 range, offering a balance of performance, fuel efficiency, and towing capability. It was primarily marketed in Europe and other regions where diesel engines were favored, though a limited number were available in the United States.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | R-class |
| Generation | R-class (W251) |
| Type (Engine) | R 280 CDI V6 (190 Hp) 4MATIC G-TRONIC |
| Start of production | 2007 |
| End of production | 2009 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (combined) | 9.3 l/100 km (25.3 US mpg, 30.4 UK mpg, 10.8 km/l) |
| CO2 emissions | 246 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 9.9 sec |
| Acceleration 0 – 62 mph | 9.9 sec |
| Acceleration 0 – 60 mph | 9.4 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Weight-to-power ratio | 11.8 kg/Hp, 84.4 Hp/tonne |
| Weight-to-torque ratio | 5.1 kg/Nm, 195.6 Nm/tonne |
| Power | 190 Hp |
| Power per litre | 63.6 Hp/l |
| Torque | 440 Nm (324.53 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.950 |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| 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 | 10.1 l (10.67 US qt | 8.89 UK qt) |
| Kerb Weight | 2250 kg (4960.4 lbs.) |
| Max. weight | 2840 kg (6261.13 lbs.) |
| Max load | 590 kg (1300.73 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) |
| 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 | 1659 mm (65.31 in.) |
| Wheelbase | 2980 mm (117.32 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 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 | 235/65 R17 |
| Wheel rims size | 17 |
INTRODUCTION
The Mercedes-Benz R 280 CDI 4MATIC G-TRONIC, part of the W251 R-Class series produced between 2007 and 2009, was a luxury crossover designed to appeal to buyers seeking a vehicle that combined the space and versatility of an SUV with the refinement and driving experience of a Mercedes-Benz passenger car. Built on the extended version of the Mercedes-Benz M-Class platform (W164), the R-Class offered optional third-row seating, accommodating up to seven passengers. The R 280 CDI variant, powered by a 3.0-liter turbocharged diesel V6, was positioned as a mid-range offering, providing a balance between performance and fuel economy. It was a popular choice in European markets, where diesel engines were prevalent, and offered a compelling alternative to traditional SUVs and minivans.
Powertrain & Engine Architecture
The heart of the R 280 CDI is the OM 642.950 3.0-liter V6 diesel engine. This engine utilizes a common rail direct injection system, delivering fuel directly into the combustion chamber at extremely high pressure for improved efficiency and reduced emissions. The engine is equipped with a variable geometry turbocharger and an intercooler, enhancing power output and responsiveness. The V6 configuration provides a smoother and more refined power delivery compared to inline engines. The engine produces 190 horsepower and 440 Nm (324.53 lb-ft) of torque. The G-TRONIC automatic transmission, a 7-speed unit, was standard. This transmission offered smooth and precise shifts, contributing to a comfortable driving experience. The transmission was electronically controlled and featured adaptive shift programs, adjusting to the driver’s style and road conditions.
Driving Characteristics
The R 280 CDI 4MATIC offered a comfortable and composed driving experience. The 7-speed automatic transmission provided smooth gear changes, and the diesel engine delivered ample torque for effortless acceleration and overtaking. While not a sports car, the R 280 CDI offered respectable performance, with a 0-60 mph time of around 9.4 seconds and a top speed of 130.49 mph. The 4MATIC all-wheel-drive system provided enhanced traction and stability, particularly in adverse weather conditions. Compared to the gasoline-powered R 350, the R 280 CDI offered superior fuel economy and a more relaxed driving experience, thanks to the diesel engine’s torque characteristics. However, it lacked the outright power and responsiveness of the gasoline engine. The gear ratios were tuned for fuel efficiency and comfortable cruising, rather than aggressive acceleration.
Equipment & Trim Levels
The R 280 CDI 4MATIC typically came well-equipped with standard features including leather upholstery, dual-zone automatic climate control, a premium audio system, and power-adjustable front seats. Optional extras included a panoramic sunroof, rear seat entertainment system, and advanced driver-assistance features such as Distronic adaptive cruise control and Parktronic parking assist. Interior trim options included various wood veneers and aluminum accents. The dashboard layout was typical of Mercedes-Benz at the time, with a focus on elegance and functionality. The R-Class offered a spacious and comfortable cabin, with ample headroom and legroom for all passengers. The optional third-row seating, while best suited for children or shorter adults, added to the vehicle’s versatility.
Chassis & Braking
The R 280 CDI 4MATIC featured a double wishbone front suspension and an independent multi-link rear suspension with a stabilizer bar. This suspension setup provided a comfortable ride and good handling characteristics. The 4MATIC all-wheel-drive system distributed power between the front and rear axles as needed, enhancing traction and stability. The braking system consisted of disc brakes on all four wheels, with ABS (Anti-lock Braking System) as standard. The R-Class’s weight, approximately 4960.4 lbs, necessitated a robust braking system to ensure adequate stopping power.
Market Reception & Comparison
The Mercedes-Benz R-Class, including the R 280 CDI variant, received mixed reviews from automotive critics. While praised for its spacious interior, comfortable ride, and advanced technology, it was often criticized for its unconventional styling and relatively high price. The R 280 CDI was generally well-regarded for its fuel efficiency and torque, making it a practical choice for long-distance driving. Compared to other trims in the R-Class lineup, such as the R 350, the R 280 CDI offered better fuel economy but less outright performance. It competed with other luxury crossovers, such as the BMW X5 and the Acura MDX, but its unique styling and seven-passenger capacity set it apart.
Legacy
The Mercedes-Benz R-Class (W251) was discontinued after the 2009 model year, due to relatively low sales. However, the R 280 CDI 4MATIC remains a sought-after vehicle in the used car market, particularly in Europe. The OM 642 diesel engine is known for its durability and reliability, provided it is properly maintained. Common maintenance items include regular oil changes, filter replacements, and inspection of the turbocharger and fuel injection system. While the R-Class’s styling may not appeal to everyone, its spacious interior, comfortable ride, and fuel-efficient diesel engine make it a practical and refined choice for buyers seeking a versatile luxury crossover.
