BMW
Z4
Mercedes-Benz
SLC
BMW Z4 vs Mercedes-Benz SLC: 2024 Comparison
The short answer
Based on available data, the Mercedes-Benz SLC comes out ahead of the BMW Z4 on fuel economy and power. Check the specs table and owner sentiment below for the full comparison before deciding between the two. Both are covered by real owner reports on CarWizz.
Specs side by side
What owners say
Z4
Overall
Sentiment is highly dependent on the specific generation and powertrain. For the current generation (G29), the Z4 M40i variant receives extremely positive feedback from owners, described as "insanely good," "stupid fast," "incredible power," "balanced," and "the best car I've ever owned." It is praised for its fun factor, driving dynamics, and value proposition, particularly when equipped with a manual transmission. The base 30i variant is considered competent but less memorable, with some reviewers labeling it "forgettable." The previous E89 generation (2009-2016) is viewed more as a comfortable grand tourer or "Palm Beach cruiser," with criticism for feeling heavy and sluggish.
Best version to buy
For the current generation (G29), the Z4 M40i is overwhelmingly recommended as the definitive version. Owners emphasize that the high-output B58 engine transforms the experience, making it "exceptional" and a "real weapon," whereas the lower-powered 30i variant does not leave the same impression.
Known issues
- ⚠**E85/E86 & E89 Generations:** Cooling system failures (water pumps, expansion tanks): common point of failure. Frequency: recurrent. Oil leaks (valve cover gaskets, oil filter housing): common with age. Frequency: recurrent.
- ⚠**G29 Generation:** Factory brake fluid inadequacy: noted as unsuitable for the car's performance level. Frequency: isolated. "Ass-backward" tachometer design: criticized layout. Frequency: isolated.
SLC
Overall
Sentiment is mixed, with a clear divide between appreciation for the car's specific qualities and disappointment in its overall execution. Owners who value the hardtop convertible experience, comfortable cruising, and Mercedes-Benz badge at a relatively attainable price report satisfaction, particularly when purchased used at a significant discount. The vehicle is consistently praised for its comfortable ride, elegant styling, and the practicality of its retractable hardtop.
Best version to buy
Insufficient owner data available to declare a consensus "best" trim. Feedback indicates the V6 models (SLC 43 AMG, or the earlier SLK 350) are preferred over the four-cylinder models for their superior power and smoother character.
Known issues
- ⚠Dated and low-quality interior: hard plastics, lack of modern technology and features compared to contemporary Mercedes models and competitors. Frequency: very frequent.
- ⚠Uninspiring driving dynamics: numb steering, lacks sporty engagement, characterized as a cruiser rather than a sports car. Frequency: very frequent.
- ⚠Convertible roof mechanism problems: potential for expensive hydraulic leaks and failures; requires thorough testing and preventive maintenance. Frequency: recurrent.
The verdict
The Mercedes-Benz SLC is the better choice for most buyers.
It has better fuel economy on its best-equipped version than the BMW Z4, based on the data above. If power matters more to you than running costs, the BMW Z4 is worth a closer look instead.
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Frequently asked questions
Which is more reliable, the BMW Z4 or the Mercedes-Benz SLC?
Owner reports show similar reliability sentiment for the BMW Z4 and the Mercedes-Benz SLC. Check the known issues listed above for specific differences between the two.
Which is better for families, the BMW Z4 or the Mercedes-Benz SLC?
Both seat a similar number of passengers based on our data. The BMW Z4 is classed as a Roadster, the Mercedes-Benz SLC as a Coupe - Cabriolet, which affects cargo space and ride height for family use.
Which has better fuel economy, the BMW Z4 or the Mercedes-Benz SLC?
The Mercedes-Benz SLC is more fuel-efficient on paper: 8.1 L/100km combined versus 9.4 L/100km for the BMW Z4, based on the best-equipped catalogued version of each.
Which is cheaper to maintain, the BMW Z4 or the Mercedes-Benz SLC?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Mercedes-Benz SLC than the BMW Z4. See the known issues comparison above.