Audi Q8, SQ8, RS Q8, 4MN / 4MT (USA)

Transfer case fluid capacity & service interval

Audi Q8, SQ8, RS Q8, 4MN / 4MT (USA) transfer case fluid capacity ranges from 0,8 to 1 liter. Service intervals include checks every 20000 miles or 24 months. The data covers 3 configurations.

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

TypeSpecifications
RS Q8 4.0 TFSI quattro (441 kW) (2019-2024)
  • Use: Normal
  • Capacity 1 liter (Initial fill)
  • Capacity 0,8 liter (Refill)
  • Check 20000 miles/ 24 months
SQ8 4.0 TFSI quattro (373 kW) (2019- )
  • Use: Normal
  • Capacity 1 liter (Initial fill)
  • Capacity 0,8 liter (Refill)
  • Check 20000 miles/ 24 months
Q8 55 TFSI quattro (250 kW) (2018- )
  • Use: Normal
  • Capacity 1 liter (Initial fill)
  • Capacity 0,8 liter (Refill)
  • Check 20000 miles/ 24 months

Additional Notes

  • The Audi Q8 55 TFSI quattro transfer case holds 1 liter at initial fill, which represents the full dry capacity used when the unit is assembled or completely drained during an overhaul.
  • The refill capacity across all three configurations is 0.8 liters, a figure that reflects the residual fluid remaining in the transfer case after a standard drain, meaning a top-up or partial service requires less fluid than a full rebuild.
  • The 0.2-liter difference between the initial fill and refill values is consistent across the Q8 55 TFSI quattro, RS Q8 4.0 TFSI quattro, and SQ8 4.0 TFSI quattro, indicating a shared transfer case design despite the significant power output differences among the three variants.
  • The RS Q8 4.0 TFSI quattro, rated at 441 kW, and the SQ8 4.0 TFSI quattro, rated at 373 kW, share identical transfer case fluid capacities with the Q8 55 TFSI quattro at 250 kW, pointing to a common unit across the performance and standard trims.
  • The specified check interval for all three configurations is 20,000 miles or 24 months under normal use conditions, meaning the interval applies to typical driving rather than demanding or high-stress operating environments.
  • A 24-month time limit accompanies the 20,000-mile threshold, so whichever of the two conditions is reached first would trigger a transfer case fluid inspection regardless of how the vehicle has been driven.

Other Systems