The Mercedes-Benz R-Class R 350 CDI 4MATIC, produced from 2010 to 2014, represented a unique offering in the luxury vehicle segment. Part of the W251 series following a facelift in 2010, this variant combined the practicality of a station wagon (estate) with the prestige of the Mercedes-Benz brand, and the capability of all-wheel drive. Positioned as a mid-to-upper range trim, the R 350 CDI aimed to appeal to buyers seeking a spacious, comfortable, and capable vehicle for family transport and long-distance travel. It was primarily sold in Europe and select international markets, with limited availability in the United States.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | R-Class |
| Generation | R-Class (W251, 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 | 8.2 kg/Hp |
| Weight-to-torque ratio | 3.5 kg/Nm |
| Power | 265 Hp @ 3800 rpm |
| Torque | 620 Nm @ 1600-2400 rpm (457.29 lb.-ft.) |
| 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 | 2175 kg (4795.05 lbs.) |
| Max. weight | 2880 kg (6349.31 lbs.) |
| Max load | 705 kg (1554.26 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.) |
| Width including mirrors | 2183 mm (85.94 in.) |
| Height | 1674 mm (65.91 in.) |
| Wheelbase | 2980 mm (117.32 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 is powered by the OM 642.872, a 3.0-liter V6 diesel engine. This engine is a cornerstone of Mercedes-Benz’s diesel offerings, known for its robust construction and refined operation. The OM 642 features a cast iron block, aluminum cylinder heads, and a sophisticated common-rail direct injection system. The common-rail system, operating at extremely high pressures, ensures precise fuel delivery and optimized combustion. A variable geometry turbocharger with an intercooler further enhances performance and efficiency. The engine produces 265 horsepower at 3800 rpm and a substantial 457 lb-ft of torque between 1600 and 2400 rpm. This torque output is a key characteristic of the engine, providing strong acceleration and effortless cruising. The engine is paired with Mercedes-Benz’s 7G-TRONIC automatic transmission, a seven-speed unit known for its smooth shifts and efficiency. The 7G-TRONIC features a torque converter lock-up clutch that engages at higher speeds to reduce slippage and improve fuel economy.
Driving Characteristics
The R 350 CDI 4MATIC delivers a comfortable and composed driving experience. The abundant torque from the diesel engine provides strong acceleration, making overtaking maneuvers easy and confident. While not a sports car, the R-Class feels surprisingly agile for its size, thanks to the well-tuned suspension and the responsive steering. The 7G-TRONIC transmission shifts smoothly and efficiently, contributing to a relaxed driving experience. Compared to the gasoline-powered R 350, the CDI offers significantly better fuel economy and a more relaxed driving style due to the broader torque curve. The 4MATIC all-wheel-drive system provides excellent traction in all weather conditions, enhancing stability and safety. The gear ratios are optimized for both highway cruising and city driving, with a relatively tall final drive ratio prioritizing fuel efficiency.
Equipment & Trim Levels
The R 350 CDI 4MATIC typically came well-equipped, reflecting its position as a premium vehicle. Standard features included leather upholstery, automatic climate control, a premium audio system, power-adjustable front seats, and a multi-function steering wheel. Optional extras included a panoramic sunroof, rear-seat entertainment system, adaptive cruise control, and parking assist. Trim levels varied by market, but generally offered options for upgraded interior finishes, exterior styling enhancements, and additional driver-assistance features. The R-Class was designed to offer a luxurious and comfortable interior, with ample space for passengers and cargo.
Chassis & Braking
The R-Class features a robust chassis designed to handle the vehicle’s weight and provide a comfortable ride. The front suspension utilizes a double wishbone design, while the rear suspension employs an independent multi-link setup with a stabilizer bar. This configuration provides a good balance between ride comfort and handling precision. The R 350 CDI is equipped with disc brakes on all four wheels, providing ample stopping power. The anti-lock braking system (ABS) and electronic stability program (ESP) enhance safety by preventing wheel lock-up and maintaining vehicle control during emergency maneuvers.
Market Reception & Comparison
The Mercedes-Benz R-Class, despite its innovative design and luxurious features, never achieved widespread popularity. Critics often cited its unconventional styling and relatively high price as drawbacks. However, the R 350 CDI variant was generally well-received for its fuel efficiency, strong performance, and comfortable ride. Compared to the R 350 gasoline model, the CDI offered superior fuel economy and torque. Compared to other luxury SUVs of the time, the R-Class offered a unique combination of space, comfort, and capability. However, it often lost out to more established competitors with stronger brand recognition.
Legacy
The OM 642 diesel engine used in the R 350 CDI is known for its durability and reliability, provided it receives regular maintenance. These engines are capable of high mileage with proper care. On the used car market, the R-Class R 350 CDI represents a relatively affordable entry point into the Mercedes-Benz luxury segment. While parts availability is generally good, specialized diesel components may require sourcing from dedicated suppliers. The R-Class, while not a commercial success, remains a unique and interesting vehicle, showcasing Mercedes-Benz’s engineering prowess and willingness to experiment with new vehicle concepts.
