Audi
Q8
Owner report available
Mercedes-Benz
GLS
Owner report available
Audi Q8 vs Mercedes-Benz GLS
The short answer
Based on available data, the Mercedes-Benz GLS comes out ahead of the Audi Q8 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
Q8
Overall
Mixed sentiment with a clear generational divide. The gasoline-powered Q8 (2019-2024) receives praise for its striking coupe-SUV styling, high-quality and comfortable interior, spacious cabin, and refined driving dynamics. However, it is heavily criticized for significant reliability concerns, particularly with major powertrain components leading to costly out-of-warranty repairs, and for very poor resale value.
Best version to buy
For the gasoline Q8/SQ8, the Prestige trim is frequently mentioned as the target for maximizing luxury features. For the performance-oriented SQ8, the Sport Package (including active roll stabilization and a sport rear differential) is specifically highlighted as a desirable option for enhanced driving dynamics.
Known issues
- **Gasoline Q8 (2019-2024):** * Major powertrain failures (water pump/coolant migration) leading to expensive repairs (~$7,500): very frequent. * Poor resale value and rapid depreciation: very frequent.
- **Q8 e-tron (Electric):** * Poor real-world range (approximately 130-180 miles / 209-290 km, significantly less in cold weather): very frequent.
GLS
Overall
Sentiment is sharply divided and heavily dependent on ownership phase and powertrain. The vehicle is universally praised for its core attributes: exceptional ride comfort, often described as "like a magic carpet," spacious and comfortable third-row seating, a luxurious and well-appointed interior, and strong, smooth V8 performance in 550/580/63 models. However, this high praise is almost universally tempered by severe criticism of ownership costs and reliability concerns beyond the initial warranty period.
Best version to buy
Insufficient owner data available to declare a single "best" version. Feedback is split by priorities: the GLS 450 is noted for being the entry point with a sacrifice in power.
Known issues
- Exorbitant maintenance and repair costs: very frequent reports of routine dealer service visits costing $1,800-$2,200, with major repairs like air suspension or differential failure costing $5,000-$30,000. Frequency: very frequent.
- Air suspension failures: described as a "common" point of failure leading to very expensive repairs ($2,250 minimum, often $5,000+). Frequency: very frequent.
- Premature tire and brake wear: rear tires last 15,000-20,000 miles; brake pads require frequent replacement; cited as an almost annual expense. Frequency: very frequent.
The verdict
The Mercedes-Benz GLS is the better choice for most buyers.
It has more power on its best-equipped version than the Audi Q8, based on the data above. If efficiency matters more to you than outright power, the Audi Q8 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 Audi Q8 or the Mercedes-Benz GLS?
Owner reports show similar reliability sentiment for the Audi Q8 and the Mercedes-Benz GLS. Check the known issues listed above for specific differences between the two.
Which is better for families, the Audi Q8 or the Mercedes-Benz GLS?
The Audi Q8 seats more passengers than the Mercedes-Benz GLS on its catalogued best-equipped version. Body type also differs: the Audi Q8 is classed as a SUV, the Mercedes-Benz GLS as a SUV.
Which has better fuel economy, the Audi Q8 or the Mercedes-Benz GLS?
The EPA rates the 2027 Audi Q8 at 19 mpg combined and the 2027 Mercedes-Benz GLS at 21 mpg, depending on the version.
Which is cheaper to maintain, the Audi Q8 or the Mercedes-Benz GLS?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Audi Q8 than the Mercedes-Benz GLS. See the known issues comparison above.