Audi A6, S6, 4G (USA)

Transfer case fluid capacity & service interval

Audi A6, S6, 4G (USA) transfer case fluid capacity ranges from 0,85 to 1 liter. Service intervals include checks at 15000 miles/24 months or 20000 miles/24 months. The data covers 14 configurations.

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

TypeSpecifications
A6 3.0 T quattro (250 kW), 4GC (2017-2018)
  • Use: Normal
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 20000 miles/ 24 months
A6 3.0 T quattro (250 kW), 4GC (2017-2018)
  • Use: First check only
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 15000 miles/ 24 months
A6 3.0 T quattro (245 kW), 4GC (2015-2017)
  • Use: Normal
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 20000 miles/ 24 months
A6 3.0 T quattro (245 kW), 4GC (2015-2017)
  • Use: First check only
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 15000 miles/ 24 months
A6 3.0 TDI quattro (176 kW), 4GC (2015-2017)
  • Use: Normal
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 20000 miles/ 24 months
A6 3.0 TDI quattro (176 kW), 4GC (2015-2017)
  • Use: First check only
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 15000 miles/ 24 months
A6 2.0 T quattro (162 kW), 4G2 (2013-2015)
  • Use: Normal
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 20000 miles/ 24 months
A6 2.0 T quattro (162 kW), 4G2 (2013-2015)
  • Use: First check only
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 15000 miles/ 24 months
A6 3.0 T quattro (228 kW), 4G2 (2013-2015)
  • Use: Normal
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 20000 miles/ 24 months
A6 3.0 T quattro (228 kW), 4G2 (2013-2015)
  • Use: First check only
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 15000 miles/ 24 months
A6 3.0 TDI quattro (176 kW), 4G2 (2013-2015)
  • Use: Normal
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 20000 miles/ 24 months
A6 3.0 TDI quattro (176 kW), 4G2 (2013-2015)
  • Use: First check only
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 15000 miles/ 24 months
A6 3.0 T quattro (228 kW), 4G2 (2011-2013)
  • Use: Normal
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 20000 miles/ 24 months
A6 3.0 T quattro (228 kW), 4G2 (2011-2013)
  • Use: First check only
  • Capacity 1 liter (Dry fill)
  • Capacity 0,85 liter (Service fill)
  • Check 15000 miles/ 24 months

Additional Notes

  • Across all listed Audi A6 quattro configurations in the 4G body series, the transfer case dry fill capacity is 1 liter, while the service fill capacity is 0.85 liter. The lower service fill figure reflects the residual fluid that remains in the unit after a drain, meaning a full refill to the dry fill volume is only required when the transfer case has been completely emptied or replaced.
  • The 0.15 liter difference between dry fill and service fill is consistent across every engine variant and model year range in these specifications, covering the 2.0 T (162 kW), 3.0 T (228 kW, 245 kW, and 250 kW), and 3.0 TDI (176 kW) quattro configurations.
  • Under normal use conditions, the transfer case check interval is 20,000 miles or 24 months for all listed configurations. The dual-unit interval means whichever threshold is reached first triggers the service requirement.
  • A separate first check only interval of 15,000 miles or 24 months applies to all listed configurations. A first check interval is an initial inspection point intended to catch early wear or fluid contamination shortly after a new or rebuilt unit enters service, after which the standard normal interval governs subsequent checks.
  • The 4G2 body code covers the A6 3.0 T quattro (228 kW) from 2011-2013 and again from 2013-2015, as well as the 2.0 T quattro (162 kW) and 3.0 TDI quattro (176 kW) from 2013-2015. All share identical transfer case capacity and interval specifications despite differences in engine output and fuel type.
  • The 4GC body code is associated with the 3.0 T quattro in two power outputs, 245 kW for 2015-2017 and 250 kW for 2017-2018, along with the 3.0 TDI quattro (176 kW) for 2015-2017. The transition from 4G2 to 4GC did not alter the transfer case fluid capacities or service intervals.
  • The 3.0 T quattro at 228 kW spans both the 4G2 body code across two consecutive date ranges, 2011-2013 and 2013-2015, with no change in transfer case specifications between the two ranges.

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