Hyundai
Sonata
Owner report available
Mazda
6
Owner report available
Hyundai Sonata vs Mazda 6
The short answer
Based on available data, the Hyundai Sonata 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.
Specs side by side
What owners say
Sonata
Overall
Sentiment is sharply divided by generation and powertrain, creating a high-risk, high-reward ownership profile. For models from approximately 2011-2019 equipped with the Theta II engine (particularly 2.0L and 2.4L variants), sentiment is overwhelmingly negative due to catastrophic, well-documented engine failures often occurring between 80,000 and 120,000 miles, leading to significant downtime, repair hassles, and loss of confidence. For the current generation (2020+), particularly hybrid models and those with newer "Smartstream" engines, sentiment shifts to positive, with owners praising superior value, advanced technology, quiet and comfortable highway ride, intuitive infotainment, and generous warranty coverage.
Best version to buy
For the current generation, the Sonata Hybrid Limited trim is frequently highlighted. Owners cite its comprehensive feature set, including a 360-degree camera, cooled seats, advanced highway driving assist (HDA), and a quiet, refined ride.
Known issues
- Catastrophic engine failure (Theta II engines, 2.0L, 2.4L): engines "grenade" or "blow" with little to no warning, often between 80,000-120,000 miles. Requires complete replacement. Frequency: very frequent for affected generations.
- Excessive oil consumption: engines "guzzle oil," particularly in models from around 2015, leading to potential engine damage if not monitored closely. Frequency: recurrent.
- Transmission failure: complete transmission replacement reported around 87,000-95,000 miles on some 2017-2018 models. Frequency: isolated.
6
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
- Thin paint / paint chipping and fading: noted on multiple generations, particularly older models. Frequency: recurrent.
- Rust issues: especially on heat shields and exhaust components, causing rattles; mentioned on pre-2014 models and some later examples. Frequency: recurrent.
- Steering wheel vibration / shake at highway speeds (55-65 mph / 89-105 km/h): often attributed to tire balance rather than mechanical fault. Frequency: isolated.
The verdict
The Hyundai Sonata is the better choice for most buyers.
It has more power on its best-equipped version than the Mazda 6, based on the data above. If efficiency matters more to you than outright power, the Mazda 6 is worth a closer look instead.
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Common problems by model year
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Frequently asked questions
Which is more reliable, the Hyundai Sonata or the Mazda 6?
Owner reports show similar reliability sentiment for the Hyundai Sonata and the Mazda 6. Check the known issues listed above for specific differences between the two.
Which is better for families, the Hyundai Sonata or the Mazda 6?
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 Hyundai Sonata or the Mazda 6?
The EPA rates the 2027 Hyundai Sonata at 26–51 mpg combined and the 2021 Mazda 6 at 26–29 mpg, depending on the version.
Which is cheaper to maintain, the Hyundai Sonata or the Mazda 6?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Mazda 6 than the Hyundai Sonata. See the known issues comparison above.