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

Differential fluid capacity & service interval

Audi A6, S6, RS 6, 4A2 / 4A5 (USA) differential fluid capacity ranges from 0,85 to 1 liter. Service intervals include checks every 20000 miles or 24 months and changes every 60000 miles. The data covers 12 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 0,9-1 liter
  • RS 6 Performance TFSI quattro (463 kW) (2023- )
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Code: 0DG
  • A6 45 TFSI quattro (195 kW) (2021- )
  • Rear
  • Use: Normal
  • Capacity 0,96 liter
  • Check 20000 miles/ 24 months
  • Code: 0BO
  • RS 6 TFSI quattro (441 kW) (2021-2023)
  • From automatic
  • Use: Normal
  • Capacity 0,9-1 liter
  • RS 6 TFSI quattro (441 kW) (2021-2023)
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Code: 0DG
  • S6 TFSI quattro (331 kW) (2019- )
  • Rear
  • Use: Normal
  • Capacity 0,95 liter
  • Check 20000 miles/ 24 months
  • Change 60000 miles
  • Code: 0D3
  • S6 TFSI quattro (331 kW) (2019- )
  • Rear
  • Use: Normal
  • Capacity 0,85 liter
  • Check 20000 miles/ 24 months
  • Code: 0G2
  • S6 TFSI quattro (331 kW) (2019- )
  • Rear, outer sections
  • Use: Normal
  • Capacity 0,93 liter
  • Check 20000 miles/ 24 months
  • Change 60000 miles
  • Code: 0D3
  • A6 45 TFSI quattro (185 kW) (2018-2021)
  • Rear
  • Use: Normal
  • Capacity 0,96 liter
  • Check 20000 miles/ 24 months
  • Code: 0BO
  • A6 55 TFSI quattro (250 kW) (2018- )
  • Rear
  • Use: Normal
  • Capacity 0,95 liter
  • Check 20000 miles/ 24 months
  • Change 60000 miles
  • Code: 0D3
  • A6 55 TFSI quattro (250 kW) (2018- )
  • Rear
  • Use: Normal
  • Capacity 0,85 liter
  • Check 20000 miles/ 24 months
  • Code: 0G2
  • A6 55 TFSI quattro (250 kW) (2018- )
  • Rear, outer sections
  • Use: Normal
  • Capacity 0,93 liter
  • Check 20000 miles/ 24 months
  • Change 60000 miles
  • Code: 0D3

Additional Notes

  • The Audi A6 45 TFSI quattro at 185 kW (2018-2021) and the 195 kW variant introduced in 2021 share an identical rear differential capacity of 0.96 liter, despite the power output difference between the two engine ratings.
  • The A6 55 TFSI quattro (250 kW) rear differential is specified across three separate capacity figures — 0.95 liter, 0.85 liter, and 0.93 liter — reflecting distinct fill points within the same drivetrain assembly, with the 0.93-liter figure attributed specifically to the outer sections of the rear differential.
  • A change interval of 60,000 miles is listed for the A6 55 TFSI quattro (250 kW) rear differential at the 0.95-liter and 0.93-liter (outer sections) fill points, while the 0.85-liter fill point carries only a check interval, with no fluid change mileage specified.
  • The check interval for rear differential fluid on the A6 45 TFSI quattro (185 kW and 195 kW) and the A6 55 TFSI quattro (250 kW) is uniformly set at 20,000 miles or 24 months under normal use conditions.
  • The S6 TFSI quattro (331 kW), introduced from 2019, carries the same three-capacity rear differential structure as the A6 55 TFSI quattro (250 kW) — 0.95 liter, 0.85 liter, and 0.93 liter for outer sections — along with the same 60,000-mile change interval at the applicable fill points.
  • The RS 6 TFSI quattro (441 kW, 2021-2023) and the RS 6 Performance TFSI quattro (463 kW, from 2023) both specify a rear differential capacity of 1 liter, which is the highest rear differential capacity value listed across all configurations in the A6 / S6 / RS 6 range covered here.
  • Both RS 6 variants list a differential capacity of 0.9-1 liter for the unit described as "differential, from automatic," indicating a range rather than a fixed fill volume, which typically reflects variation depending on fluid level at the time of service rather than a full drain-and-fill overhaul figure.
  • No check or change intervals are listed for either RS 6 variant — neither the 441 kW nor the 463 kW — across both the rear differential and the differential sourced from the automatic transmission, in contrast to the interval data present for the A6 and S6 configurations.

Other Systems