The short answer
Based on available data, the Volkswagen Passat comes out ahead of the Mazda 6 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.
Overall
Sentiment is broadly positive, with the Mazda 6 consistently praised for its reliability, longevity, and driving dynamics. Long-term owner reports frequently highlight the vehicle's ability to reach high mileages (e.g., 250,000 miles, 377,000 miles) with minimal major issues when properly maintained. The car is commended for its handsome design, well-regarded interior quality in its class, and a driving experience often described as more engaging than key competitors like the Toyota Camry and Honda Accord.
Best version to buy
Insufficient owner data available to declare a single "best" trim or version across all generations. Feedback is divided by powertrain preference.
Known issues
Overall
Sentiment is highly polarized and varies significantly by generation, engine, and market. For certain generations and powertrains, particularly the 2.5L 5-cylinder and pre-2012 TDI models, owner feedback is positive, praising solid build quality, timeless design, comfortable highway cruising, and strong diesel fuel economy (reports of 60+ MPG/3.9 L/100km on motorways). However, a very frequent and dominant criticism centers on below-average long-term reliability and high maintenance costs, especially for turbocharged gasoline (TSI) and certain diesel (TDI) engines.
Best version to buy
For reliability and low cost of ownership, the 2.5L 5-cylinder naturally aspirated gasoline engine (available in North American models circa 2006-2014) is very frequently recommended as "rock solid" and dependable, despite being less powerful and efficient. For fuel efficiency, the 1.9L and 2.0L TDI diesel engines are highly regarded, with the older 1.9L noted for legendary longevity, though the newer 2.0L TDI's DEF/emissions systems are a recurrent source of expensive problems.
Known issues
The verdict
The Volkswagen Passat is the better choice for most buyers.
It has stronger reliability sentiment in owner reports than the Mazda 6, based on the data above. If the specific known issues on the Volkswagen Passat are a dealbreaker, the Mazda 6 is worth a closer look instead.
Common problems by model year
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Owner reports lean more positive on reliability for the Volkswagen Passat than the Mazda 6. See the known issues comparison above for the specific concerns owners report on each.
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.
The EPA rates the 2021 Mazda 6 at 26–29 mpg combined and the 2022 Volkswagen Passat at 28 mpg, depending on the version.
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Volkswagen Passat than the Mazda 6. See the known issues comparison above.