Comparison BMW 3 Series (E21) 320i (125 Hp) & BMW 7 Series (F01) 740d (306 Hp) & Mercedes-Benz E-class (W211) E 240 V6 (177 Hp)
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| Brand: | BMW | BMW | Mercedes-Benz |
| Model: | 3 Series | 7 Series | E-class |
| Generation: | 3 Series (E21) | 7 Series (F01) | E-class (W211) |
| Engine / modification: | 320i (125 Hp) | 740d (306 Hp) | E 240 V6 (177 Hp) |
| Production start: | 1975 year | 2008 year | 2002 year |
| Production end: | 1977 year | 2011 year | 2006 year |
| Coupe type: | Sedan | Sedan | Sedan |
| Num. of Doors: | 2 | 4 | 4 |
| Num. of seats: | 5 | 5 | 5 |
| Fuel consumption / economy - urban: | 9.0 l/100 km | 15.9 l/100 km | |
| Fuel consumption / economy - extra urban: | 5.7 l/100 km | 7.6 l/100 km | |
| Fuel consumption / economy - combined: | 6.9 l/100 km | 10.8 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel | Petrol (Gasoline) |
| Fuel tank volume: | 58 l | 80 l | 65 l |
| Power: | 125 hp | 306 hp | 177 hp |
| Max power in: | 5800 rpm. | 4400 rpm. | 5700 rpm. |
| Maximum speed: | 182 km/h | 250 km/h | 236 km/h |
| Acceleration from 0 to 100 km/h: | 9.9 sec | 6.3 sec | 9.6 sec |
| Torque: | 170 Nm @ 4000 rpm. | 600 Nm @ 1500-2500 rpm. | 240 Nm @ 4500 rpm. |
| Model Engine: | M10 | N57D30 | M 112.913 |
| Engine position: | Front, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 1990 cm3 | 2993 cm3 | 2597 cm3 |
| Engine oil capacity: | 4.0 l | 6.5 l | 8.0 l |
| Coolant: | 8.9 l | 9.5 l | |
| Fuel System: | Multi-point injection | Diesel Commonrail | Multi-point injection |
| Aspiration / Turbine: | Twin-power turbo | ||
| Position of cylinders: | Inline | Inline | V engine |
| Valvetrain: | OHC | ||
| Number of cylinders: | 6 | 6 | 6 |
| Number of valves per cylinder: | 2 | 4 | 3 |
| Compression ratio: | 9.7 | 10.5 | |
| Piston Stroke: | 66 mm | 90 mm | 68.2 mm |
| Cylinder Bore: | 80 mm | 84 mm | 89.9 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive | |
| Number of Gears (automatic transmission): | 6 | 5 | |
| Number of Gears (manual transmission): | 5 | 6 | |
| Length: | 4355 mm | 5072 mm | 4818 mm |
| Width: | 1610 mm | 1902 mm | 1822 mm |
| Height: | 1380 mm | 1479 mm | 1452 mm |
| Wheelbase: | 2563 mm | 3070 mm | 2854 mm |
| Front track: | 1366 mm | 1611 mm | 1577 mm |
| Rear (Back) track: | 1373 mm | 1650 mm | 1570 mm |
| Ride height(clearance): | 145 mm | ||
| Minimum volume of Luggage (trunk): | 404 l | 540 l | |
| Front suspension: | Double wishbone | ||
| Rear suspension: | Independent, spring multi-link with stabilizer | ||
| Max weight: | 2505 kg | 2200 kg | |
| Front brakes: | Disc | Ventilated discs | |
| Rear brakes: | Disc | Disc | |
| Kerb Weight: | 1090 kg | 1950 kg | 1695 kg |
| ABS: | yes | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | ||
| Minimum turning circle (turning diameter): | 11.4 m | ||
| Tire size: | 245/50 R 18 Y | 205/60 R16 | |
| Wheel rims size: | 8J x 18 | R16 |