Audi
A5
Mercedes-Benz
C-class
Audi A5 vs Mercedes-Benz C-class: 2025 Comparison
The short answer
The Audi A5 offers fuel economy, while the Mercedes-Benz C-class excels at power instead. Choose the Audi A5 if you prioritize fuel economy in daily driving, or the Mercedes-Benz C-class if power matters more for your needs. Both are covered by real owner reports on CarWizz.
Specs side by side
What owners say
A5
Overall
Sentiment is sharply divided by generation. For the B9/B9.5 generation (approximately 2017-2024 models), feedback is overwhelmingly positive. Owners praise these models for being "rock solid," offering a superb driving experience ("drives like it's on rails"), excellent build quality with no squeaks even at high mileage, and strong reliability with proper maintenance.
Best version to buy
For the B9/B9.5 generation, the A5 Sportback is the most recommended body style for its blend of coupe-like aesthetics and hatchback practicality. The S-Line trim is strongly advised for its superior interior and sportier suspension.
Known issues
- ⚠**B9/B9.5 Generation (2017-2024):** * High maintenance and repair costs out of warranty. Frequency: very frequent. * Known issues with the 2.0T engine (e.g., water pump failure). Frequency: recurrent.
- ⚠**B10 Generation (2025+):** * Severe software and electronic glitches (drive assist failures, phantom alerts, SOS connectivity loss, infotainment crashes). Frequency: very frequent. * Unreliable mobile app and digital key functionality.
C-class
Overall
\nSentiment is mixed and highly dependent on generation, model year, and comparison context. For the W205 generation (approx. 2015-2021), feedback is generally positive, describing it as a comfortable, refined, and well-built daily driver that feels satisfyingly competent and smooth in normal conditions. It is frequently praised for offering a good value proposition in the luxury sedan segment.
Best version to buy
\nFor the W205 generation, the diesel models (e.g., 220d) are highlighted for their reliability and fuel economy, with the 2.1L diesel specifically noted for being "pretty much unkillable." The C300 with 4MATIC is also frequently recommended for its balance of power and all-weather capability. There is a strong recommendation to seek models equipped with conventional tires over run-flats for improved ride comfort.
Known issues
- ⚠\n**Declining interior build quality (W206 generation)**: Creaks, peeling plastics, and materials that do not age well compared to older Mercedes models or competitors.
The verdict
The Audi A5 is the better choice for most buyers.
It has better fuel economy on its best-equipped version than the Mercedes-Benz C-class, based on the data above. If power matters more to you than running costs, the Mercedes-Benz C-class is worth a closer look instead.
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Frequently asked questions
Which is more reliable, the Audi A5 or the Mercedes-Benz C-class?
Owner reports show similar reliability sentiment for the Audi A5 and the Mercedes-Benz C-class. Check the known issues listed above for specific differences between the two.
Which is better for families, the Audi A5 or the Mercedes-Benz C-class?
Both seat a similar number of passengers based on our data. The Audi A5 is classed as a Station wagon, the Mercedes-Benz C-class as a Sedan, which affects cargo space and ride height for family use.
Which has better fuel economy, the Audi A5 or the Mercedes-Benz C-class?
The Audi A5 is more fuel-efficient on paper: 2.2-7.4 L/100km combined versus 6.9 L/100km for the Mercedes-Benz C-class, based on the best-equipped catalogued version of each.
Which is cheaper to maintain, the Audi A5 or the Mercedes-Benz C-class?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Mercedes-Benz C-class than the Audi A5. See the known issues comparison above.