Audi S4/S5 B8 Buying Guide

The Audi S4 and S5 B8 & B8.5 models, produced between 2009 and 2016, offer strong performance, comfortable interiors, and good reliability when maintained correctly. This guide will help potential buyers understand key differences between the two models and what to look for when purchasing one.

Check out our S4/S5 B8/8.5 part pages here

S4 vs S5: Key Differences

The main difference between the S4 and S5 in this generation is the body style. The S4 is a four-door saloon, making it more practical for families and those needing extra space. The S5 comes in both coupe and cabriolet versions, catering to those who prefer a sportier look. Mechanically, the B8 S4 uses the 3.0-litre supercharged V6 engine, while the B8 S5 coupe retains the older 4.2-litre naturally aspirated V8. Once Audi introduced the B8.5 facelift in 2012, both the S4 and S5 moved to the same 3.0-litre turbocharged V6 engine, providing a balance between performance and efficiency.

Common Issues and What to Check

Engine and Supercharger

For B8 models:

• Thermostat and Water Pump – These components can fail, leading to coolant leaks and overheating. Check for recent replacements.
• PCV Valve Failure – A faulty PCV valve can cause excessive oil consumption and poor performance.
• Supercharger Pulley Wear – The factory supercharger pulley may wear over time. Some owners opt for upgraded pulleys for better performance.

For B8.5 models:

• Turbocharger Issues – The new 3.0-litre turbocharged V6 introduced in the B8.5 can experience turbo-related problems, particularly carbon buildup in the intake system.

Gearbox

• S-Tronic (7-Speed DSG) – The dual-clutch transmission can suffer from mechatronic unit failure or clutch pack wear. Ensure smooth gear changes during a test drive.
• Manual (6-Speed) – Generally robust, but check for clutch wear, especially on tuned vehicles.

Suspension and Handling

• Control Arms and Bushings – Worn bushings can cause knocking noises and vague steering feel.
• Adaptive Dampers (Optional) – Cars equipped with Audi Drive Select may have adaptive dampers, which can be costly to replace.

Brakes

Standard brakes are adequate for daily driving, but spirited driving can cause excessive wear. Look for discs and pads with plenty of life left. Check out our range of brake discs, brake pads and other braking items for your Audi S4/S5 here

Interior and Electronics

• MMI System Issues – Check that the infotainment system functions properly, as failures can be expensive to fix.
• Seats and Trim Wear – Leather seats, particularly in the S5 coupe and cabriolet, can show signs of wear. Alcantara options in the S4 tend to age better.

Maintenance and Running Costs

Regular servicing is key to keeping an S4 or S5 in good condition. Service intervals are typically every 10,000 miles or annually. Key maintenance costs include:

• Oil Changes – Required every 10,000 miles or annually.
• DSG Service – If fitted, the S-Tronic gearbox requires servicing every 40,000 miles.
• Brakes and Tyres – Expect high-performance tyres and brakes to wear faster than standard models.

Conclusion

The Audi S4 and S5 B8 & B8.5 models are well-built and offer a good balance of performance and practicality. The S4 is the better option for those needing more space, while the S5 appeals to those who prioritise styling. When buying, focus on service history, common faults, and how well the car has been maintained. A well-cared-for example can provide a rewarding ownership experience.