Audi A6, S6, RS 6, 4B (EU)

Power steering fluid capacity & service interval

Audi A6, S6, RS 6, 4B (EU) models utilize power steering fluid with a capacity of 2,7 liters. Service intervals require a check every 24 months or 30000 km. The data covers 3 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
  • RS 6 4.2 V8 Turbo quattro (353 kW) (2004-2005)
  • System, power steering/brake booster/levelling
  • Use: Normal
  • Capacity 2,7 liter
  • Check 24 months/ 30000 km
  • RS 6 4.2 V8 Turbo quattro (331 kW) (2002-2005)
  • System, power steering/brake booster/levelling
  • Use: Normal
  • Capacity 2,7 liter
  • Check 24 months/ 30000 km
  • S6 4.2 V8 40V quattro (1999-2005)
  • System, power steering/brake booster/levelling
  • Use: Normal
  • Capacity 2,7 liter
  • Check 24 months/ 30000 km

Additional Notes

  • The Audi A6, S6, RS 6 4B (EU) power steering fluid capacity of 2.7 liters applies across all three listed configurations and reflects a shared hydraulic system that serves power steering, brake booster, and levelling functions together rather than power steering alone.
  • A combined hydraulic system of 2.7 liters is notably larger than a dedicated power steering circuit would typically require, which is consistent with the added fluid demand of an integrated brake booster and suspension levelling circuit.
  • The S6 4.2 V8 40V quattro carries a 2.7-liter hydraulic system capacity across a 1999-2005 model year span, making it the longest-running configuration among the listed entries at six model years.
  • The RS 6 4.2 V8 Turbo quattro at 331 kW and the higher-output 353 kW variant share an identical 2.7-liter hydraulic fluid capacity despite the difference in power output, indicating the hydraulic system architecture was not revised between the two states of tune.
  • The 353 kW RS 6 variant covers a 2004-2005 model year range, while the 331 kW RS 6 covers 2002-2005, meaning both outputs were available concurrently during 2004-2005 with no difference in hydraulic fluid capacity between them.
  • The service interval for all three configurations is specified as a check at 24 months or 30,000 km under normal use conditions, whichever comes first, rather than a full fluid replacement, which is consistent with hydraulic fluid monitoring practices where contamination and level are assessed periodically.

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