Audi S4/S5 B8 Maintenance Guide

Maintaining your Audi S4 or S5 from the B8 and B8.5 generations is essential for long-term reliability. Over the years, these models have featured different engine configurations. The B8 S4 typically uses a 3.0-litre supercharged V6, while the B8 S5 was available with either a 4.2-litre naturally aspirated V8 or a 3.0-litre supercharged unit. With the B8.5 facelift, both the S4 and S5 were updated to a 3.0-litre turbocharged V6. Understanding these differences can help in planning appropriate maintenance.

Check out our range of service parts and packages for your Audi here

Routine Service Intervals

Audi recommends a regular service schedule to keep these vehicles running smoothly. Although it is best to refer to the owner's manual for exact details, the typical intervals are:

• Oil Change and Basic Service: Every 10,000 miles (16,000 kilometres) or 12 months, whichever comes first. This service includes an oil change, filter replacements, and a general inspection.
• DSG (S-Tronic) Transmission Service: For models fitted with the dual-clutch gearbox, service is generally recommended every 40,000 miles (64,000 kilometres). This helps maintain smooth shifting and prolongs the gearbox life.
• Brake, Tyre and Suspension Checks: Inspect these components during each service. High-performance parts may require more frequent attention depending on usage.

Looking to upgrade your brakes? Check out our dedicate brake parts page for your S4/S5 here. 

Engine and Component Care

Supercharged Engines (B8 S4 and some B8 S5 models)

• Cooling System: Regularly check the water pump and thermostat, as these components can be prone to wear.
• PCV Valve: Monitor for any signs of excessive oil consumption or performance issues.
• Supercharger Maintenance: Look for unusual noises or reduced performance that may indicate wear on the supercharger pulley.

Turbocharged Engine (B8.5 S4/S5)

• Turbocharger: Ensure that the intake system is kept clean to avoid carbon buildup, which can affect turbo performance.
• Regular Inspections: Due to the increased stress on turbo components, periodic checks are advisable, particularly if the vehicle is used for spirited driving.

Naturally Aspirated V8 (B8 S5 Cabriolet)

• Cooling and Oil Systems: These components require regular checks to avoid overheating and to maintain smooth performance.

Additional Maintenance Points

• Transmission: Whether manual or DSG, verify that gear changes are smooth during routine drives. Address any irregularities promptly.
• Suspension and Bushings: Inspect for signs of wear such as knocking noises or loose steering, and replace parts when necessary.
• Electronics and MMI System: Check that the infotainment and control systems operate correctly. Faulty electronics can lead to higher repair costs if left unchecked.

Final Thoughts

The Audi S4/S5 B8 and B8.5 models offer a range of engine options and require a consistent maintenance approach. Following the recommended service schedule—every 10,000 miles (16,000 km) for basic servicing and 40,000 miles (64,000 km) for DSG maintenance—can help ensure reliability and performance. Regular checks of the engine, transmission, brakes, and suspension will help identify issues early, making maintenance more manageable over the life of the vehicle.

By keeping to these guidelines, owners can enjoy the driving experience these cars offer while minimising unexpected repairs.