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2006. - 2009. Production 2004. - 2008.
S - Sports car Vehicle class S - Sports car
cabriolet, 2 door Body style cabriolet, 2 door
Rear Wheel drive Rear
Dimensons & Volumes
4091 mm
Length 4089 mm
1781 mm
Width 1777 mm
1299 mm
Height 1296 mm
240 liters
Boot (min) 208 liters
260 liters
Boot (max) 300 liters
55 liters
Fuel tank 70 liters
Mercedes Benz
3.0 M272 KE30
Petrol Fuel Petrol
6 - Inline, 4 valves per cylinder Configuration 6 - V config, 4 valves per cylinder
Naturally Aspir. Aspiration Naturally Aspir.
2497 cc
Displacement 2996 cc
218 hp
Power 231 hp
250 Nm
Torque 300 Nm
Performance (manual gearbox)
manual gearbox - 6 gears
manual gearbox - 6 gears
1260 kg
Vehicle weight 1340 kg
6.5 s
Acc. 0-100 6.3 s
240 km/h
Top speed 250 km/h
12.0 l/100km
Cons. (urban) 13.8 l/100km
6.3 l/100km
Cons. (highway) 7.2 l/100km
8.4 l/100km
Cons. (average) 9.7 l/100km
202 g/km
CO2 emissions 231 g/km
Performance (automatic gearbox)
automatic - 6 gears
automatic - 7 gears
1295 kg
Vehicle weight 1360 kg
6.9 s
Acc. 0-100 6.2 s
238 km/h
Top speed 250 km/h
12.8 l/100km
Cons. (urban) 12.9 l/100km
6.8 l/100km
Cons. (highway) 7.0 l/100km
9.0 l/100km
Cons. (average) 9.3 l/100km
216 g/km
CO2 emissions 231 g/km
13500 EUR
Price from 10000 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 6-cylinder, 24-valves 231hp engine designed by Mercedes Benz.


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. Moving further on, let's take a closer look at some additional safety-related facts. Both vehicles belong to the sports car segment, which is generally classifying them somewhere in the middle safety-wise, but it doesn't do much to help us decide between the two. On the other hand, if we'd like to consider vehicle mass in this context too, which we definitely should, SLK offers a marginal difference of 6% more metal.


I don't like generalizing things when it comes to reliability, although it does seem that both brands display similar results in faults and breakdowns, all the models observed together. These are the results of an independent reasearch, while our visitors describe reliability of BMW with an average rating of 4.3, and models under the Mercedes Benz badge with 4.5 out of 5. Some independent research have also placed Z4 as average reliability-wise, and SLK 4% above the first one. That apart, owners of different cars powered by the same engine as BMW Z4 rank it on average as 4.0 out of 5, exactly the same as the other one.

Performance & Fuel economy

Mercedes Benz is a bit more agile, reaching 100km/h in 0.2 seconds less than its competitor. In addition to that it accelerates all the way to 250 kilometers per hour, 10km/h more 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 15% difference compared to SLK.


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 Mercedes Benz 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. Anyway, that's the most objective conclusion I could've came up with and it's based solely on the information found on this website. Aspects such as design, practicality, brand value and driving experience are there for you to measure them out. 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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