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2021 Audi S8 Maintenance guide

v1.0Updated Jun 2, 2026·Daniel Wilson4 Sources Analyzed2 Critical Recalls
MAINTENANCE SUMMARY

The 2021 Audi S8 demands diligent maintenance, with a focus on addressing potential ECM moisture ingress and rear seat belt retractor issues. Its 'Below Average' reliability verdict, underscored by 54 recalls and 254 TSBs, necessitates proactive inspections and adherence to service schedules.

View Critical Issue: ECM Moisture Ingress
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Reliability Score

6.2/ 10

Est. Annual Maintenance Cost

$600 - $1,000

TSBs & Recalls

254 TSBs | 54 Recalls

SummaryMaintenance & CostsCommon FailuresSymptoms & PreventionKeep ReadingFAQSources

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Key Takeaways

  • Proactive maintenance is essential due to the 'Below Average' reliability verdict.
  • Prioritize inspections and repairs related to ECM moisture ingress and rear seat belt function.

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Critical service intervals
Common failure analysis
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MethodologyHow we score →

Scores are derived from NHTSA recalls and owner complaints, normalized by vehicle segment averages.

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Quick links for routine service and common repair parts.

  • 5W-40 Synthetic Oil
  • Oil Filter
  • Drain Plug Washer
  • Synthetic Engine Oil
  • Cabin Air Filter

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