Audi
A6
Infiniti
M
Audi A6 vs Infiniti M: 2025 Comparison
The short answer
Based on available data, the Infiniti M comes out ahead of the Audi A6 on 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
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.
M
Overall
Owner sentiment is generally positive, with the M series praised for its powerful and reliable V8 and V6 engines, engaging driving dynamics, and comfortable, well-equipped interiors. The vehicles are consistently described as fun to drive, offering significant performance for the price, especially on the used market. However, this enthusiasm is tempered by very frequent and strong consensus on high ownership costs, including poor fuel economy, expensive premium fuel requirements, and costly repairs for specific, recurring mechanical and electrical issues as mileage increases.
Best version to buy
Insufficient owner data available to declare a consensus "best" version. Feedback is split between generations and engines.
Known issues
- ⚠High fuel consumption: Reported real-world fuel economy of 16-18 MPG in city/spirited driving and 22 MPG on highway for V8 models; described as "terrible" and a major ongoing cost. Frequency: very frequent.
- ⚠Expensive/Recurring Oil Leaks: Valve cover gaskets are cited as a frequent failure point, with OEM replacements noted as expensive (~$400 each). Frequency: very frequent.
- ⚠Electrical/Gremlin Issues: Isolated but severe reports of unexplained electrical problems affecting multiple systems (e.g., transmission behavior, sunroof operation) following unrelated repairs, suggesting complex wiring or module vulnerab…
The verdict
The Infiniti M is the better choice for most buyers.
It has more power on its best-equipped version than the Audi A6, based on the data above. If efficiency matters more to you than outright power, the Audi A6 is worth a closer look instead.
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Frequently asked questions
Which is more reliable, the Audi A6 or the Infiniti M?
Owner reports show similar reliability sentiment for the Audi A6 and the Infiniti M. Check the known issues listed above for specific differences between the two.
Which is better for families, the Audi A6 or the Infiniti M?
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 Infiniti M?
Fuel consumption data is limited for one or both models. Check the specs table above for the figures available on each catalogued version.
Which is cheaper to maintain, the Audi A6 or the Infiniti M?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Infiniti M than the Audi A6. See the known issues comparison above.