Audi
A6
Cadillac
CTS
Audi A6 vs Cadillac CTS: 2025 Comparison
The short answer
The Audi A6 offers fuel economy, while the Cadillac CTS excels at power instead. Choose the Audi A6 if you prioritize fuel economy in daily driving, or the Cadillac CTS if power matters more for your needs. Both are covered by real owner reports on CarWizz.
Specs side by side
What owners say
A6
Overall
Sentiment is sharply divided by generation and powertrain. For the C7 (approx. 2012-2018) and C8 (approx. 2019-2023) generations, owner feedback is generally positive, praising the cars for their refined driving experience, comfortable and quiet ride, spacious interiors, and strong performance from the 3.0-liter engines (both TFSI and TDI). The A6 Allroad variant, in particular, receives high marks for its air suspension comfort, practicality, and impressive highway fuel economy.
Best version to buy
For the C7/C8 generations, the A6 Allroad 55 TDI (in Europe) and the A6 3.0T (55 TFSI) are highly recommended for their robust power delivery, torque, and reported reliability. The Prestige trim is favored for its comprehensive technology and comfort features, including the head-up display, massaging seats, and superior sound insulation.
Known issues
- ⚠High maintenance and repair costs: very frequent. General concerns about long-term reliability and expensive out-of-warranty repairs: very frequent. Wireless CarPlay connectivity issues (dropping, failure to connect): recurrent.
CTS
Overall
Sentiment is mixed and heavily dependent on generation and specific powertrain. The third-generation CTS (2014-2019) and its high-performance variants (CTS-V, V-Sport) receive significant praise for their handling dynamics, competitive performance, and value proposition when compared to German rivals. The Alpha platform is frequently cited as providing world-class handling, with some owners stating these models handled better than direct competitors.
Best version to buy
Insufficient owner data available to declare a single "best" version. High-performance V-Sport and CTS-V models are highlighted for their engaging driving experience and competitive performance.
Known issues
- ⚠Transmission problems: Includes shuddering, slipping, delayed engagement, and complete failure. Affects the 8-speed automatic (8L45/8L90) in later models and older automatics in earlier models. Very frequent.
- ⚠Cadillac User Experience (CUE) infotainment system failures: Screen delamination, unresponsive touchscreen, phantom touches, and complete failure requiring costly replacement. Very frequent.
- ⚠Electrical system issues: Battery drain problems, faulty sensors, malfunctioning modules (TCM, ECM communication loss), anti-theft system malfunctions, and accessory failures (heated/cooled seats, steering wheel buttons). Very frequent.
The verdict
The Audi A6 is the better choice for most buyers.
It has better fuel economy on its best-equipped version than the Cadillac CTS, based on the data above. If power matters more to you than running costs, the Cadillac CTS is worth a closer look instead.
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Frequently asked questions
Which is more reliable, the Audi A6 or the Cadillac CTS?
Owner reports show similar reliability sentiment for the Audi A6 and the Cadillac CTS. Check the known issues listed above for specific differences between the two.
Which is better for families, the Audi A6 or the Cadillac CTS?
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 Audi A6 or the Cadillac CTS?
The Audi A6 is more fuel-efficient on paper: 6.7-7.8 L/100km combined versus 13.8 L/100km for the Cadillac CTS, based on the best-equipped catalogued version of each.
Which is cheaper to maintain, the Audi A6 or the Cadillac CTS?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Cadillac CTS than the Audi A6. See the known issues comparison above.