Infiniti
Q30
Mercedes-Benz
A-class
Infiniti Q30 vs Mercedes-Benz A-class: 2022 Comparison
The short answer
The Infiniti Q30 offers fuel economy, while the Mercedes-Benz A-class excels at power instead. Choose the Infiniti Q30 if you prioritize fuel economy in daily driving, or the Mercedes-Benz A-class if power matters more for your needs. Both are covered by real owner reports on CarWizz.
Specs side by side
What owners say
Q30
Overall
Owner sentiment is mixed, with a clear divide between appreciation for its driving dynamics, fuel economy, and perceived value, and significant criticism regarding reliability, maintenance costs, and brand support. The vehicle is frequently praised for its Mercedes-Benz-sourced 2.0-liter turbocharged engine and AWD system, which contribute to a driving experience described as responsive and enjoyable, particularly in Sport mode. Fuel economy is noted as a strong point, with diesel models reportedly achieving 60-65 MPG (UK) on short drives and 40-55 MPG on longer journeys.
Best version to buy
Insufficient owner data available to designate a specific trim as "best." Discussions suggest the 2.0-liter turbocharged petrol and diesel engines are the primary powertrains of interest. The Sport trim is mentioned for its driving mode, but no trim-level consensus emerges from the available feedback.
Known issues
- ⚠Major electrical/system failures: simultaneous failure of power steering, 4WD, ABS, and emergency brake systems with multiple warning lights; suspected software glitch or wiring harness issue. Frequency: isolated.
- ⚠Expensive and frequent mechanical repairs: reports include cracked coolant pipes (£2,800 / ~$3,500 USD), complete A/C system failure (£3,400 / ~$4,300 USD), and persistent headlight issues that could not be resolved even after replacement…
- ⚠Engine reliability concerns: the Mercedes-sourced 2.0L turbocharged (M274) engine is noted as being prone to piston failures, turbo issues, and water pump failures by those familiar with the platform.
A-class
Overall
\nMixed to negative sentiment overall, with a strong consensus on poor long-term reliability and high ownership costs. The vehicle is acknowledged for its attractive interior design, modern technology features like the dual-screen layout and ambient lighting, and competent handling compared to mainstream competitors. However, these positives are heavily overshadowed by very frequent and severe criticisms regarding fragile interior build quality, complex and expensive electrical failures, and significant powertrain reliability issues, particularly with the 2.0L turbocharged engine (M282).
Best version to buy
\nInsufficient owner data available to identify a consensus "best" trim or version. Feedback is overwhelmingly focused on platform-wide criticisms rather than trim comparisons.\n\nRecommended Configurations\nInsufficient specific configuration advice from owners.
Known issues
- ⚠\nPoor interior build quality and fragile components: interior features cheap plastics prone to snapping and breaking; simple failures (e.g., center console latch, sunshades, glove boxes) require expensive full assembly replacements.
The verdict
The Infiniti Q30 is the better choice for most buyers.
It has better fuel economy on its best-equipped version than the Mercedes-Benz A-class, based on the data above. If power matters more to you than running costs, the Mercedes-Benz A-class is worth a closer look instead.
Explore further
Not sure which one fits you?
Answer a few questions and get a personalized recommendation.
Frequently asked questions
Which is more reliable, the Infiniti Q30 or the Mercedes-Benz A-class?
Owner reports show similar reliability sentiment for the Infiniti Q30 and the Mercedes-Benz A-class. Check the known issues listed above for specific differences between the two.
Which is better for families, the Infiniti Q30 or the Mercedes-Benz A-class?
Data on family-specific factors like cargo space is limited for one or both models, but based on available reports, both are positioned as practical daily drivers. Check the specs table above for seating and body type.
Which has better fuel economy, the Infiniti Q30 or the Mercedes-Benz A-class?
The Infiniti Q30 is more fuel-efficient on paper: 6.7 L/100km combined versus 8.8-9.2 L/100km for the Mercedes-Benz A-class, based on the best-equipped catalogued version of each.
Which is cheaper to maintain, the Infiniti Q30 or the Mercedes-Benz A-class?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Infiniti Q30 than the Mercedes-Benz A-class. See the known issues comparison above.