Comparison Mercedes-Benz R-class Long (V251) AMG 63 V8 (510 Hp) 4MATIC 7G-TRONIC AMG SPEEDSHIFT & Mercedes-Benz S-class Long (V140, facelift 1994) S 420 V8 (279 Hp) 5G-TRONIC
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| Brand: | Mercedes-Benz | Mercedes-Benz |
| Model: | R-class | S-class |
| Generation: | R-class Long (V251) | S-class Long (V140, facelift 1994) |
| Engine / modification: | AMG 63 V8 (510 Hp) 4MATIC 7G-TRONIC AMG SPEEDSHIFT | S 420 V8 (279 Hp) 5G-TRONIC |
| Production start: | 2006 year | 1995 year |
| Production end: | 2007 year | 1998 year |
| Coupe type: | Sedan | |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 24.1 l/100 km | |
| Fuel consumption / economy - extra urban: | 11.8 l/100 km | |
| Fuel consumption / economy - combined: | 16.3 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Fuel tank volume: | 80 l | 100 l |
| Power: | 510 hp | 279 hp |
| Max power in: | 6800 rpm. | 5700 rpm. |
| Maximum speed: | 250 , Electronically limited km/h | 245 km/h |
| Acceleration from 0 to 100 km/h: | 5.1 sec | 8.3 sec |
| Torque: | 630 Nm @ 5200 rpm. | 400 Nm @ 3900 rpm. |
| Model Engine: | M 156 E 62 / 156.980 | M 119.981 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 6208 cm3 | 4196 cm3 |
| Engine oil capacity: | 9.6 l | 7.5 l |
| Coolant: | 7.5 l | 16.5 l |
| Valvetrain: | DOHC | DOHC |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 11.3 | 11 |
| Piston Stroke: | 94.6 mm | 78.9 mm |
| Cylinder Bore: | 102.2 mm | 92 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | 5 G-TRONIC |
| Length: | 5165 mm | 5213 mm |
| Width: | 1922 mm | 1886 mm |
| Height: | 1634 mm | 1486 mm |
| Wheelbase: | 3215 mm | 3140 mm |
| Front track: | 1665 mm | 1606 mm |
| Rear (Back) track: | 1652 mm | 1579 mm |
| Minimum volume of Luggage (trunk): | 525 l | |
| Max weight: | 2950 kg | 2650 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Ventilated discs |
| Kerb Weight: | 2385 kg | 2000 kg |
| Steering type: | Cone worm with recirculation balls | |
| Power steering: | Hydraulic Steering | Hydraulic Steering |
| Minimum turning circle (turning diameter): | 12.51 m | |
| Tire size: | Front wheel tires: 265/45 R20 | 235/60 R16 |
| Wheel rims size: | Front wheel rims: 8.5J x 20 | 7.5J x 16 |