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Car #1
Car #2

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2006. - 2009.
S - Sports car
cabriolet, 2 door
Vehicle class
Body style
Wheel drive
2007. - 2009.
S - Sports car
cabriolet, 2 door

Dimensons & Volumes

4091 mm
1781 mm
1299 mm
240 liters
260 liters
55 liters
Boot (min)
Boot (max)
Fuel tank
4100 mm
1813 mm
1274 mm
66 liters
157 liters
52 liters


6 - Inline, 4 valves per cylinder
Nat. Asp.
2497 cc
218 hp
250 Nm
Opel / General Motors
2.0 Z20NHH
4 - Inline, 4 valves per cylinder
1998 cc
264 hp
353 Nm

Performance (manual gearbox)

manual gearbox - 6 gears
1260 kg
6.5 s
240 km/h
12.0 l/100km
6.3 l/100km
8.4 l/100km
202 g/km
Gearbox type
Vehicle weight
Acc. 0-100
Top speed
Cons. (urban)
Cons. (highway)
Cons. (average)
CO2 emissions
manual gearbox - 5 gears
1306 kg
5.7 s
229 km/h
13.0 l/100km
6.9 l/100km
9.2 l/100km
218 g/km

Performance (automatic gearbox)

automatic - 6 gears
1295 kg
6.9 s
238 km/h
12.8 l/100km
6.8 l/100km
9.0 l/100km
216 g/km
Gearbox type
Vehicle weight
Acc. 0-100
Top speed
Cons. (urban)
Cons. (highway)
Cons. (average)
CO2 emissions


13500 EUR
428 - 465 EUR
Price from
12850 EUR
222 - 258 EUR

Virtual Adviser's™ opinion


Well, these are two pretty similar cars we have here! It's only details that could potentially make the difference. Considering they both belong to the sports car segment and utilize the same 2-door cabriolet body style and the rear wheel drive system, it all comes up to the specific petrol engine choice they offer. The first one has a BMW-engineered powertrain under the hood, a 6-cylinder, 24-valves 218hp unit, while the other one gets its power and torque from a 4-cylinder, 16-valves 264hp engine designed by Opel.


The fact that the BMW got tested by the European New Car Assessment Programme (Euro NCAP), while the other contender didn't, offers a slight advantage, as the 4-star rating is better than none. Still, apart from the official crash test results there are other things we need to be aware of. Both vehicles belong to the sports car segment, which is generally classifying them somewhere in the middle safety-wise, but that fact doesn't break the tie between the two cars. On the other hand, taking kerb weight as an important factor into account, Opel GT offers a marginal difference of 4% more metal.


I don't like generalizing things when it comes to reliability, although it does seem that Opel does have a slight advantage, at least on all of the models level. These are the results of an independent reasearch, while our visitors describe reliability of BMW, as well as Opel, with the same average rating of 4.2 out of 5. Unfortunatelly, I don't have enough insight that would allow me to comment in more details on the specific models level. Above it all, drivers of cars with the same engine as BMW Z4 rank it on average as 4.0, while the one under the competitor's bonnet gets 3.0 out of 5.

Performance & Fuel economy

Opel is a bit more agile, reaching 100km/h in 0.8 seconds less than its competitor. Still, it lacks the power to win the top speed competition, topping at 229 kilometers per hour, 11km/h less than the other car. When it comes to fuel economy the winner has to be BMW Z4, averaging around 8.4 liters of fuel per 100 kilometers (34 mpg), in combined cycle. We can't ignore that 10% difference compared to Opel GT.


BMW appears just a bit more reliable, although the difference is truly marginal. The most important thing when deciding between any two vehicles should always be safety, both passive and active. In my opinion, everything taken into account, BMW Z4 offers much better overall protection, which launches it ahead of the other contender. From there things take a different direction, with Opel offering somewhat better performance, just enough to call it quicker. It does come at a cost though, and that's the fuel consumption... All together, there's not much more to say, in this case I wouldn't even consider anything but BMW. In any case that's my personal view, built upon all the data available to me. What should decide here though is the way you feel about the two vehicles, and I hope you'll find my guidelines useful in the process. Also, you could use the oportunity to find out which car, everything taken into account, would be the perfect choice for you in the eyes of the virtual adviser, among more than 12.000 different ones in our database.

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