Audi A6, S6, RS 6, 4A2 / 4A5 (USA)

Transfer case fluid capacity & service interval

Audi A6, S6, RS 6, 4A2 / 4A5 (USA) models require transfer case fluid with a capacity range of 0,8 to 1 liter. The data covers 3 configurations.

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

TypeSpecifications
  • RS 6 Performance TFSI quattro (463 kW) (2023- )
  • From automatic
  • Use: Normal
  • Capacity 0,8-1 liter
  • RS 6 TFSI quattro (441 kW) (2021-2023)
  • From automatic
  • Use: Normal
  • Capacity 0,8-1 liter
  • S6 TFSI quattro (331 kW) (2019- )
  • From automatic
  • Use: Normal
  • Capacity 1 liter

Additional Notes

  • The RS 6 Performance TFSI quattro (463 kW) and RS 6 TFSI quattro (441 kW) share a transfer case fluid capacity range of 0.8-1 liter, indicating a service fill specification rather than a fixed volume, which accounts for variation in residual fluid retained during a drain procedure.
  • The Audi A6, S6, RS 6 (4A2 / 4A5) S6 TFSI quattro (331 kW) carries a fixed transfer case capacity of 1 liter, representing the upper bound of the range seen across the RS 6 variants and suggesting a consistent fill-to-overflow service method.
  • All three configurations specify transfer case fluid under normal use conditions, meaning the listed capacities apply to standard operating environments rather than severe-duty cycles such as towing or off-road use.
  • Each row notes the transfer case as a transferbox sourced from the automatic transmission assembly, which is relevant to understanding why the fluid capacity is relatively small at under 1 liter compared to the main transmission sump.
  • The RS 6 TFSI quattro (441 kW) covers model years 2021-2023, while the S6 TFSI quattro (331 kW) starts from 2019, meaning the S6 variant has the longest presence in the specified year range among the three configurations.

Other Systems