Audi
RS4
Owner report available
Audi
S5
Owner report available
Audi RS4 vs Audi S5
The short answer
Based on available data, the Audi RS4 comes out ahead of the Audi S5 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
RS4
Overall
Sentiment is deeply polarized, split between passionate admiration for the driving experience and significant criticism regarding ownership costs and reliability. The naturally aspirated 4.2L V8 engine is universally praised for its sound, high-revving character (8000 rpm redline), and raw, engaging feel, which owners describe as a defining and special characteristic. The vehicle is celebrated for its handling, often attributed to the DRC (Dynamic Ride Control) hydraulic suspension, which provides a planted, confident feel.
Best version to buy
Insufficient owner data available to designate a specific model year or trim as "best." The B7 generation (2006-2008) is the primary subject of discussion. The manual transmission is strongly implied as the preferred choice over the automated single-clutch transmission due to reliability concerns with the latter.
Known issues
- Timing chain and tensioner wear: Plastic guides can become brittle and fail, potentially causing catastrophic engine damage; located at the rear of the engine, requiring engine removal for service. Frequency: very frequent.
- Intake valve carbon buildup: Causes misfires and rough running, requires walnut shell blasting to clean, a recurrent maintenance item. Frequency: very frequent.
- DRC (Dynamic Ride Control) suspension failure: Hydraulic system prone to leaking, very expensive to repair through Audi; many owners opt for aftermarket coilover replacements. Frequency: very frequent.
S5
Overall
Sentiment is sharply divided by generation. The B8.5 (supercharged V6) and B9/B9.5 (turbocharged V6) generations receive generally positive feedback from long-term owners, who praise the driving experience, comfort, and timeless styling. However, these generations are associated with several known, potentially expensive mechanical issues.
Best version to buy
Insufficient owner data available to declare a single "best" version. For the B9/B9.5 generation (2018-2024), the Sportback body style is frequently mentioned for its superior practicality.
Known issues
- **B10 Generation (2025+):** Persistent check engine lights with numerous fault codes, leading to repeated dealership visits and extended downtime. Frequency: very frequent.
- **B9/B9.5 Generation (2018-2024) with 3.0T Engine:** Water pump failure, often leading to coolant migration. Frequency: very frequent. PCV (Positive Crankcase Ventilation) valve failure. Frequency: very frequent.
- **B8.5 Generation (2013-2016) with Supercharged V6:** Water pump failure. Frequency: recurrent. Wheel bearing failures. Frequency: isolated.
The verdict
The Audi RS4 is the better choice for most buyers.
It has more power on its best-equipped version than the Audi S5, based on the data above. If efficiency matters more to you than outright power, the Audi S5 is worth a closer look instead.
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Frequently asked questions
Which is more reliable, the Audi RS4 or the Audi S5?
Owner reports show similar reliability sentiment for the Audi RS4 and the Audi S5. Check the known issues listed above for specific differences between the two.
Which is better for families, the Audi RS4 or the Audi S5?
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 RS4 or the Audi S5?
The EPA rates the 2008 Audi RS4 at 14–15 mpg combined and the 2027 Audi S5 at 23 mpg, depending on the version.
Which is cheaper to maintain, the Audi RS4 or the Audi S5?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Audi S5 than the Audi RS4. See the known issues comparison above.