2008 BMW Z4 vs. 2013 BMW 6 series
To start off, 2013 BMW 6 series is newer by 5 year(s). Which means there will be less support and parts availability for 2008 BMW Z4. In addition, the cost of maintenance, including insurance, on 2008 BMW Z4 would be higher. At 4,395 cc (8 cylinders), 2013 BMW 6 series is equipped with a bigger engine. In terms of performance, 2013 BMW 6 series (437 HP @ 5500 RPM) has 99 more horse power than 2008 BMW Z4. (338 HP @ 7900 RPM) In normal driving conditions, 2013 BMW 6 series should accelerate faster than 2008 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 2013 BMW 6 series weights approximately 515 kg more than 2008 BMW Z4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2013 BMW 6 series is all wheel drive (AWD), it will have significant more traction and grip than 2008 BMW Z4. In wet, icy, snow, or gravel driving conditions, 2013 BMW 6 series will offer significantly more control. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 2013 BMW 6 series (649 Nm @ 4500 RPM) has 284 more torque (in Nm) than 2008 BMW Z4. (365 Nm @ 4900 RPM). This means 2013 BMW 6 series will have an easier job in driving up hills or pulling heavy equipment than 2008 BMW Z4. 2013 BMW 6 series has automatic transmission and 2008 BMW Z4 has manual transmission. 2008 BMW Z4 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2013 BMW 6 series will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2008 BMW Z4 | 2013 BMW 6 series | |
| Make | BMW | BMW |
| Model | Z4 | 6 series |
| Year Released | 2008 | 2013 |
| Body Type | Convertible | Convertible |
| Engine Position | Front | Front |
| Engine Size | 3246 cc | 4395 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 338 HP | 437 HP |
| Engine RPM | 7900 RPM | 5500 RPM |
| Torque | 365 Nm | 649 Nm |
| Torque RPM | 4900 RPM | 4500 RPM |
| Engine Bore Size | 91 mm | 89 mm |
| Engine Stroke Size | 87 mm | 88 mm |
| Engine Compression Ratio | 11.5:1 | 10.0 :1 |
| Fuel Type | Gasoline | Gasoline |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 5 seconds | 4.4 seconds |
| Drive Type | Rear | AWD |
| Transmission Type | Manual | 8-speed automatic |
| Number of Seats | 2 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1485 kg | 2000 kg |
| Vehicle Length | 4870 mm | 4896 mm |
| Vehicle Height | 1480 mm | 1369 mm |
| Wheelbase Size | 2500 mm | 2855 mm |
| Fuel Tank Capacity | 70 L | 70 L |
