The Mercedes-Benz R-Class Long (V251) R 280 CDI V6, produced from 2007 to 2009, represented a unique offering in the luxury vehicle segment. Positioned as a spacious, six or seven-seat vehicle, the R-Class aimed to blend the practicality of a minivan with the prestige and driving experience associated with the Mercedes-Benz brand. The “Long” designation indicated an extended wheelbase version, primarily sold in European and select international markets, offering increased rear passenger legroom and cargo capacity. The R 280 CDI V6 variant, equipped with a diesel engine and the 7G-TRONIC automatic transmission, served as a mid-to-upper trim level within the R-Class lineup, appealing to buyers prioritizing fuel efficiency and comfortable long-distance cruising.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | R-Class |
| Generation | R-Class Long (V251) |
| Type (Engine) | R 280 CDI V6 (190 Hp) 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 l/100 km (26.1 US mpg, 31.4 UK mpg, 11.1 km/l) |
| CO2 emissions | 238 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 9.8 sec |
| Acceleration 0 – 62 mph | 9.8 sec |
| Acceleration 0 – 60 mph | 9.3 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Weight-to-power ratio | 11.8 kg/Hp, 84.6 Hp/tonne |
| Weight-to-torque ratio | 5.1 kg/Nm, 196 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 | 2245 kg (4949.38 lbs.) |
| Max. weight | 2860 kg (6305.22 lbs.) |
| Max load | 615 kg (1355.84 lbs.) |
| 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.) |
| Height | 1659 mm (65.31 in.) |
| Wheelbase | 3215 mm (126.57 in.) |
| Minimum turning circle | 12.4 m (40.68 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 7 |
| Gearbox type | 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 |
Powertrain & Engine Architecture
The heart of the R 280 CDI V6 is the OM 642.950 3.0-liter V6 diesel engine. This engine, a mainstay in many Mercedes-Benz vehicles of the era, utilizes a common rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. A variable geometry turbocharger with an intercooler further enhances performance and efficiency. The engine produces 190 horsepower and a substantial 440 Nm (324.53 lb.-ft.) of torque. The torque curve is relatively flat, providing strong pulling power across a wide range of engine speeds. The engine features four valves per cylinder and is longitudinally mounted within the chassis. Paired with the engine is the 7G-TRONIC automatic transmission, a seven-speed unit known for its smooth shifting and efficiency. This transmission allows for closer gear ratios, optimizing engine performance and fuel economy.
Driving Characteristics
The R 280 CDI V6 offers a comfortable and refined driving experience. While not a sports car, the engine’s torque output provides adequate acceleration, with a 0-60 mph time of around 9.3 seconds. The 7G-TRONIC transmission contributes to smooth gear changes, minimizing disruptions during acceleration. Compared to the gasoline-powered R 350, the R 280 CDI offers significantly better fuel economy and a more relaxed cruising experience. However, it lacks the outright power and responsiveness of the higher-output gasoline engines. The rear-wheel-drive configuration provides a balanced feel, although it doesn’t offer the all-wheel-drive capability available on some R-Class models. The long wheelbase contributes to a stable ride, but can make maneuvering in tight spaces slightly more challenging.
Equipment & Trim Levels
The R 280 CDI V6 typically came well-equipped, reflecting its position as a mid-to-upper trim level. Standard features included leather upholstery, automatic climate control, a premium audio system, and power-adjustable front seats. Optional extras included a panoramic sunroof, navigation system, rear seat entertainment, and various driver assistance systems. Interior trim options varied, with choices in wood veneers and aluminum accents. The R-Class was designed with versatility in mind, offering configurable seating arrangements to accommodate varying passenger and cargo needs.
Chassis & Braking
The R-Class Long utilizes a double wishbone suspension at the front and an independent multi-link spring suspension with a stabilizer bar at the rear. This suspension setup prioritizes ride comfort and stability. The R 280 CDI, due to its weight, is equipped with disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) is standard. The steering is power-assisted, offering a light and responsive feel. The tires are typically 235/65 R17, providing a good balance of comfort and grip.
Market Reception & Comparison
The Mercedes-Benz R-Class, despite its innovative design, faced mixed reception in the market. Critics praised its spaciousness, comfortable ride, and fuel efficiency (particularly the diesel variants). However, its unconventional styling and minivan-like proportions were often criticized. The R 280 CDI V6 was generally well-regarded for its blend of performance and economy. Compared to the R 350, it offered better fuel economy and lower running costs, but lacked the same level of outright performance. Compared to other luxury SUVs of the time, the R-Class offered a unique combination of space and refinement, but struggled to gain widespread acceptance due to its polarizing design.
Legacy
The OM 642 engine family, including the OM 642.950 found in the R 280 CDI, is known for its durability and reliability when properly maintained. The 7G-TRONIC transmission is also generally considered a robust unit. However, like any vehicle of this age, the R-Class can be susceptible to age-related issues, such as suspension component wear and potential issues with the air suspension system (if equipped). On the used car market, the R 280 CDI V6 represents a relatively affordable entry point into the Mercedes-Benz luxury segment. Its fuel efficiency and spaciousness make it a practical choice for families or individuals needing a versatile vehicle. While not a collector’s item, well-maintained examples are sought after by those appreciating its unique blend of luxury and practicality.
