Complete reliability guide – Audi S4 B8 / B8.5 (2010 – 2016)
Introduction
The Audi S4 B8 represents a major milestone in the history of the S range. Produced from 2010 to 2016 , it embodies the fifth generation of the S4, replacing the naturally aspirated V8-powered S4 B7.
This generation marks the return of the V6 engine, but this time supercharged by a mechanical compressor , a first in the modern Audi range.
Available as a sedan, Avant estate and, depending on the market, as an S5 Coupé or Cabriolet, the S4 B8 is based on the Audi-Volkswagen group's MLB platform, shared with several high-end models (A5, Q5, A6, or even Porsche Macan).
Do you already own an Audi S4 B8 and want to personalize it? Discover all our accessories for your model in our shop.
1. Overview of the S4 B8
1.1. Production Period
– S4 B8: from 2009 to 2012 (phase 1)
– S4 B8.5: from 2013 to 2016 (phase 2, facelift)
1.2. Main differences between B8 and B8.5
– Exterior: the front lights adopt a new LED light signature; the grille is redesigned; the front bumper receives trapezoidal air intakes instead of the round fog lights of the B8.
– Interior: new flat-bottomed steering wheel, modernized multimedia system (MMI), improved materials, more intuitive controls.
– Technical: electromechanical power steering, reliable S-tronic gearbox, central ring differential.
2. Mechanics and performance
2.1. The 3.0 TFSI V6 engine
This is the heart of the S4 B8: a 3.0-litre V6 with a mechanical supercharger (Roots type) and direct injection.
– Aluminum block and cylinder heads
– Power: 333 hp
– Torque: 440 Nm
– Maximum speed: approximately 7,000 rpm
– Architecture: Eaton supercharger between the cylinder banks, feeding two air-to-water intercoolers
– Engine codes: CAKA, CREC, CMUA depending on the year
Remarkable optimization potential
The Audi S4 B8's 3.0 TFSI V6 engine is particularly popular with enthusiasts for its significant performance potential . Thanks to its Eaton supercharger, this engine easily handles a slight increase in boost pressure and revised electronic management.
An engine reprogramming (stage 1) , without mechanical modification, generally allows reaching around 400 horsepower and more than 500 Nm of torque , while maintaining excellent reliability if maintenance is rigorous and the intake temperature remains controlled.
This evolution transforms the vehicle's behavior: acceleration becomes more responsive, revving even more linear, and torque is available across a wide range of use. The engine nevertheless retains its smooth and progressive character, ideal for everyday driving.
3. Engine options in detail
3.0 TFSI – CAKA engine (2009 – 2012)
First version of the compressed V6.
Key features:
– Excellent compromise between power and enjoyment
– Immediate responsiveness thanks to the compressor
– Low fuel consumption for 333 hp (8–9 L/100 km in relaxed driving)
Known weaknesses:
– Coolant leaks (water pump or thermostat)
– Timing chain tensioner sometimes noisy when cold
– Valve fouling due to direct injection
– Sensitive S-tronic gearbox (fragile mechatronics in the early years)
– Some faulty electronic sensors (air pressure, temperature)
3.0 TFSI – CREC engine (2015 – 2016)
Latest evolution of the supercharged V6.
Notable improvements:
– Mixed injection (direct + indirect), limiting calamine
– Reinforced water pump
– Screwed pulley, more reliable
Reliability: excellent, very few problems reported.
4. Gearboxes and transmission
4.1. 6-speed manual gearbox
– Pleasant to handle and virtually indestructible
– Only weak point: worn clutch on remapped versions
– Average lifespan: over 150,000 km on the original vehicle
4.2. 7-speed S-tronic transmission (DL501)
– Oil-bath dual-clutch transmission
– Very fast, but demanding in terms of maintenance
– Jerking and gearbox warning light on phase B8 (mechatronics)
– Significantly improved reliability on the B8.5
– Mandatory oil change every 60,000 km (oil + strainer)
4.3. Quattro All-Wheel Drive
– Permanent system with central differential
– B8: classic Torsen differential
– B8.5: crown differential, faster and better balanced
4.4. Sport rear differential (optional)
– Torque vectoring of up to 80% to the outside wheel when cornering
– Sensations similar to propulsion
– Hydraulic module leak possible, but rare
5. Running gear and braking
5.1. Suspension
– Front and rear multi-link architecture
– Very effective but sensitive to wear on the silent blocks and ball joints
– Clunking noises at low speed, vibrations when braking
– Solution: complete replacement of the suspension arms
5.2. Management
– B8: electro-hydraulic steering
– B8.5: electromechanical steering, more direct
– Possible leaks on the pump or hose on phase 1
5.3. Braking
– Ventilated discs: 345 mm at the front, 330 mm at the rear
– Powerful and durable braking
– Brake pads to be replaced every 40,000–60,000 km
– Brake discs to be replaced around 100,000 km
6. Cooling and power supply
– Fragile water pump on versions prior to 2013
– Thermostat difficult to access, located under the compressor
– Very reliable mechanical compressor, provided the belt and tensioner pulley are replaced around 120,000 km
7. Exhaust and intake systems
– Durable stainless steel line, not very susceptible to corrosion
– Possible leaks at clamps or fittings
– Reduced fouling on CREC dual-injection engines
8. Electronic systems and passenger compartment
8.1. Multimedia (MMI)
– B8: Older interface without Bluetooth reading
– B8.5: smoother version and audio compatible
– Known problems: frozen screen, temperamental CD player
8.2. Air conditioning
– Compressor is sometimes noisy
– Faulty internal temperature sensor on some models
8.3. Sunroof and sealing
– Possible leaks due to blocked drains
– Cleaning recommended twice a year
8.4. Bang & Olufsen audio system
– Its exceptional
– Amplifier in the trunk is sensitive to humidity (random sound cutouts)
9. Consumption and usage costs
9.1. Consumption
– Moderate driving: 8–9 L/100 km
– Dynamic driving: 12–14 L/100 km
10. Summarized Known Problems
| Element | Symptom | Probable cause | Solution |
|---|---|---|---|
| Water pump | Fluid loss | Cracked plastic body | Aluminum pump |
| Thermostat | Slow heating | Internal blockage | Replacement |
| Distribution chain | Noise when cold | Tired tensioner | Overhauled tensioner |
| S-tronic transmission | Jerking / warning light | Mechatronics | Repair |
| Valves | Unstable idle | Calamine | Intake cleaning |
| Suspension | Clicking | Worn silent blocks | New arms |
| Audio | Sound cuts | Humidity | Insulation or replacement |
11. Strengths of the S4 B8
– Exceptional engine: smooth, powerful, responsive
– High-performance Quattro all-wheel drive
– A chassis that strikes a balance between comfort and sportiness
– High-end interior
– Affordable maintenance for the category
– Safe handling in all weather conditions
12. Weak points to watch out for
– Water pump and thermostat were fragile before 2013
– Chain tensioner could be improved on early models
– Fussy S-tronic gearbox without regular fluid changes
– Intake system fouling on direct injection
– Expensive suspension to redo
– High weight, rapid tire wear
13. Which version should I choose?
| Profile | Recommended version |
|---|---|
| Daily use | S4 B8.5 S-tronic CREC engine |
| Passionate driver | S4 B8 manual with sport differential |
| Search for reliability | Phase 2 (2013–2016), follow-up interview |
| Light preparation | Manual or well-maintained S-tronic version |
14. Recommended preventive maintenance
– Annual engine oil change, even at low mileage
– S-tronic transmission fluid change every 60,000 km
– Regular checks of the water pump and thermostat
– Clean the intake manifold every 80,000 km
– Brake fluid should be replaced every 2 years
– Running gear check at each service
15. Value and market of second-hand goods
In 2025:
– From €12,000 for a high-mileage Phase 1 model
– Up to €30,000 for a well-equipped and maintained Phase 2 model
Value criteria:
– Complete Audi service history
– Documented S-tronic oil changes
– Sport differential
– Black Optical Pack
– Impeccable leather/Alcantara upholstery
16. Conclusion
The Audi S4 B8 remains a versatile and elegant sports sedan .
Its supercharged V6 combines flexibility, power and reliability provided it is rigorously maintained.
The B8.5 versions (2013–2016) are the safest choice : improved reliability, corrected S-tronic gearbox, cleaner engine and superior driving pleasure.
With a well-maintained example, the S4 B8 offers a rare driving pleasure , while remaining usable on a daily basis — an ideal compromise between luxury sedan and sporty character.
