Comparison Opel Diplomat B 2.8 E (165 Hp) & Opel Omega B Caravan (facelift 1999) 3.2 V6 (218 Hp) Automatic & Opel Astra K Sports Tourer 1.6 CDTi (136 Hp) ecoFLEX start&stop
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| Brand: | Opel | Opel | Opel |
| Model: | Diplomat | Omega | Astra |
| Generation: | Diplomat B | Omega B Caravan (facelift 1999) | Astra K Sports Tourer |
| Engine / modification: | 2.8 E (165 Hp) | 3.2 V6 (218 Hp) Automatic | 1.6 CDTi (136 Hp) ecoFLEX start&stop |
| Production start: | 1969 year | 2002 year | 2015 year |
| Production end: | 1975 year | 2003 year | |
| Coupe type: | Sedan | Combi | Combi |
| Num. of Doors: | 4 | 5 | 5 |
| Num. of seats: | 5 | 5 | 5 |
| Fuel consumption / economy - urban: | 16.9 l/100 km | 4.5 - 4.7 l/100 km | |
| Fuel consumption / economy - extra urban: | 9 l/100 km | 3.4 - 3.5 l/100 km | |
| Fuel consumption / economy - combined: | 11.9 l/100 km | 3.8 - 3.9 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.45 | ||
| Fuel tank volume: | 80 l | 75 l | 48 l |
| Emission standard: | EURO VI | ||
| CO2 emissions: | 104 - 101 g/km | ||
| Power: | 165 hp | 218 hp | 136 hp |
| Max power in: | 5600 rpm. | 6000 rpm. | 3500-4000 rpm. |
| Maximum speed: | 190 km/h | 232 km/h | 205 km/h |
| Acceleration from 0 to 100 km/h: | 10.5 sec | 9.5 sec | 10.1 sec |
| Torque: | 229 Nm @ 4100-4600 rpm. | 290 Nm/3400 rpm. | 320 Nm/2000-2250 rpm. |
| Engine position: | Front, longitudinal | Front, transverse | |
| Engine displacement: | 2784 cm3 | 3175 cm3 | 1598 cm3 |
| Fuel System: | Multi-point injection | Multi-point injection | Diesel Commonrail |
| Aspiration / Turbine: | Turbo / Intercooler (Turbocharging / Intercooler) | ||
| Position of cylinders: | Inline | V engine | Inline |
| Valvetrain: | SOHC | DOHC | |
| Number of cylinders: | 6 | 6 | 4 |
| Number of valves per cylinder: | 2 | 4 | |
| Compression ratio: | 9.5 | 10 | 16 |
| Piston Stroke: | 69.8 mm | 88 mm | 80.1 mm |
| Cylinder Bore: | 92 mm | 87.5 mm | 79.7 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive | |
| Number of Gears (automatic transmission): | 4 | ||
| Number of Gears (manual transmission): | 4 | 6 | |
| Length: | 4920 mm | 4898 mm | 4702 mm |
| Width: | 1852 mm | 1776 mm | 1809 mm |
| Width with mirrors folded: | 1871 mm | ||
| Width including mirrors: | 2042 mm | ||
| Height: | 1450 mm | 1540 mm | 1499 mm |
| Wheelbase: | 2850 mm | 2730 mm | 2662 mm |
| Front track: | 1510 mm | 1514 mm | 1548 mm |
| Rear (Back) track: | 1512 mm | 1530 mm | 1565 mm |
| Ride height(clearance): | 150 mm | ||
| Minimum volume of Luggage (trunk): | 475 l | 540 l | 540 l |
| Maximum amount of Luggage (trunk): | 1800 l | 1630 l | |
| Front suspension: | Helical spring | ||
| Rear suspension: | Helical spring | ||
| Max weight: | 2030 kg | 2305 kg | 1975 kg |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Ventilated discs | Disc |
| Kerb Weight: | 1530 kg | 1733 kg | 1328 kg |
| ABS: | yes | yes | |
| Steering type: | Worm-reduction unit | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | ||
| Max. roof load: | 75 kg | ||
| Minimum turning circle (turning diameter): | 11.8 m | 11.05 m | |
| Permitted trailer load with brakes (12%): | 1400 kg | 1403 kg | |
| Permitted trailer load without brakes: | 700 kg | 680 kg | |
| Tire size: | 225/55 R16 | 205/55 R16; 225/45 R17 | |
| Wheel rims size: | R16 | 6.5J x 16; 7.5J x 17 |