The 4.0L twin-turbo V8 engine can develop oil leaks, often from valve cover gaskets or oil cooler seals. These leaks can lead to low oil levels and potential engine damage if not addressed promptly. Estimated repair cost: $500 - $1500.

While robust, the twin-turbochargers on the S8 can experience wear over time, potentially leading to reduced boost pressure or failure. Issues can stem from oil supply problems or internal wear. Estimated repair cost: $2000 - $4000+.

Air Suspension System Malfunctions

The adaptive air suspension, while providing a comfortable ride, can develop leaks or component failures. Issues with air springs, compressors, or valve blocks are not uncommon on high-mileage examples. Estimated repair cost: $1000 - $3000+.

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2018 Audi S8 Maintenance guide

Name: Maintenance dataset for 2018 Audi S8
Creator: Carfocal

v1.0Updated Jun 2, 2026Daniel Wilson4 Sources Analyzed

MAINTENANCE SUMMARY

The 2018 Audi S8, with its 605 hp 4.0L V8 and All-Wheel Drive, demands diligent maintenance. A high TSB count of 124 suggests potential underlying issues requiring proactive attention, despite zero owner complaints.

View Critical Issue: Turbocharger Issues

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Reliability Score

Est. Annual Maintenance Cost

$700 - $1,200

TSBs & Recalls

124 TSBs | 1 Recalls

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Key Takeaways

Proactive maintenance is essential due to a high TSB count.
Regular fluid changes, especially for the engine and transmission, are critical.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance