The Mercedes-Benz R-class Long (V251) R 500 V8 4MATIC G-TRONIC, produced from 2008 to 2010, 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 expected of a Mercedes-Benz. The “Long” wheelbase version, as detailed here, was primarily marketed in Europe and other regions outside of North America, where the standard wheelbase R-class was less popular. This R 500 variant sat at the top of the range, offering the most powerful engine option and all-wheel drive as standard. It was a relatively short production run, superseded by revisions to the R-Class lineup.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | R-class |
| Generation | R-class Long (V251) |
| Type (Engine) | R 500 V8 (388 Hp) 4MATIC G-TRONIC |
| Start of production | 2008 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 18.2-18.4 l/100 km (12.9 – 12.8 US mpg, 15.5 – 15.4 UK mpg, 5.5 – 5.4 km/l) |
| Fuel consumption (extra urban) | 9.8-10.0 l/100 km (24 – 23.5 US mpg, 28.8 – 28.2 UK mpg, 10.2 – 10 km/l) |
| Fuel consumption (combined) | 12.9-13.1 l/100 km (18.2 – 18 US mpg, 21.9 – 21.6 UK mpg, 7.8 – 7.6 km/l) |
| CO2 emissions | 306 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.3 sec |
| Acceleration 0 – 62 mph | 6.3 sec |
| Acceleration 0 – 60 mph | 6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 5.8 kg/Hp, 171.3 Hp/tonne |
| Weight-to-torque ratio | 4.3 kg/Nm, 234 Nm/tonne |
| Power | 388 Hp @ 6000 rpm |
| Power per litre | 71 Hp/l |
| Torque | 530 Nm @ 2800-4800 rpm (390.91 lb.-ft. @ 2800-4800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 273.963 |
| Engine displacement | 5461 cm3 (333.25 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 98 mm (3.86 in.) |
| Piston Stroke | 90.5 mm (3.56 in.) |
| Compression ratio | 10.7:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 9 l (9.51 US qt | 7.92 UK qt) |
| Coolant | 10.1 l (10.67 US qt | 8.89 UK qt) |
| Kerb Weight | 2265 kg (4993.47 lbs.) |
| Max. weight | 2920 kg (6437.5 lbs.) |
| Max load | 655 kg (1444.03 lbs.) |
| Trunk (boot) space – maximum | 2385 l (84.23 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 G-TRONIC |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 255/55 R19 W |
| Wheel rims size | 19 |
Powertrain & Engine Architecture
The R 500 V8 was powered by the M273.963 engine, a 5.46-liter naturally aspirated V8. This engine was a mainstay of the Mercedes-Benz lineup during the mid-2000s, known for its smooth power delivery and relatively high efficiency for its displacement. It featured a three-valve per cylinder design (two intake, one exhaust) and a multi-port fuel injection system. The engine produced 388 horsepower at 6000 rpm and 530 Nm (390.91 lb-ft) of torque between 2800 and 4800 rpm. The engine was longitudinally mounted in the front of the vehicle. Paired with the engine was the 7G-TRONIC automatic transmission, a seven-speed unit that offered smooth and relatively quick shifts. This transmission was designed to balance performance with fuel economy, and its seven gears allowed the engine to operate efficiently at highway speeds.
Driving Characteristics
The R 500 V8 offered a significantly different driving experience compared to the four-cylinder and V6 versions of the R-class. The V8 provided ample power for effortless acceleration and confident highway cruising. The 0-60 mph sprint was dispatched in around 6 seconds, and the car felt stable and composed even at higher speeds. The 7G-TRONIC transmission contributed to a relaxed driving experience, with smooth gear changes and a willingness to downshift when needed. While not a sports car, the R 500 offered a level of performance that was unexpected for a vehicle of its size and configuration. Compared to the manual transmission options available on lower trims, the automatic provided greater convenience, but at the expense of some driver engagement. The 4MATIC all-wheel-drive system provided excellent traction in all weather conditions.
Equipment & Trim Levels
The R 500 V8 typically came well-equipped, reflecting its position as the flagship model. Standard features included leather upholstery, wood trim, a premium sound system, automatic climate control, and a host of safety features such as ABS, traction control, and multiple airbags. Optional extras included a panoramic sunroof, rear-seat entertainment system, and advanced parking assist features. The interior was designed to be luxurious and comfortable, with ample space for passengers in all three rows. The long wheelbase version offered even more legroom for rear passengers compared to the standard wheelbase model.
Chassis & Braking
The R-class Long featured a double wishbone front suspension and an independent multi-link rear suspension with a stabilizer bar. This suspension setup was designed to provide a comfortable ride while maintaining good handling characteristics. The R 500 V8 was equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The ABS system helped to prevent wheel lockup during hard braking. The chassis was reinforced to handle the increased power and weight of the V8 engine.
Market Reception & Comparison
The R-class, in general, received mixed reviews. Critics praised its spacious interior and luxurious features, but many found its styling unconventional and its handling somewhat cumbersome. The R 500 V8 was generally well-regarded for its performance, but its high price and fuel consumption were drawbacks. Compared to the R 350 (V6) models, the R 500 offered significantly more power and a more refined driving experience, but it came at a substantial price premium. Fuel economy was considerably lower with the V8, and maintenance costs were higher due to the more complex engine and drivetrain.
Legacy
The Mercedes-Benz R-class, while not a commercial success, remains a unique and interesting vehicle. The R 500 V8, in particular, is appreciated by enthusiasts for its powerful engine and luxurious features. The M273 V8 engine is generally considered to be reliable, although it is prone to certain issues such as oil leaks and timing chain wear. Today, well-maintained examples of the R 500 V8 can be found on the used car market, offering a relatively affordable entry point into the world of Mercedes-Benz luxury and performance. Its blend of space, comfort, and power continues to appeal to a niche group of buyers seeking a versatile and distinctive vehicle.
