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

Coolant capacity & service interval

Audi A6, S6, RS 6, 4A2 / 4A5 (USA) coolant capacity is 10 liters. Service intervals consist of 20000 miles or 24 months. The data covers 6 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- )
  • Use: Normal
  • Capacity 10 liter
  • Check 20000 miles/ 24 months
A6 45 TFSI quattro (195 kW) (2021- )
  • Use: Normal
  • Capacity 10 liter
  • Check 20000 miles/ 24 months
RS 6 TFSI quattro (441 kW) (2021-2023)
  • Use: Normal
  • Capacity 10 liter
  • Check 20000 miles/ 24 months
S6 TFSI quattro (331 kW) (2019- )
  • Use: Normal
  • Capacity 10 liter
  • Check 20000 miles/ 24 months
A6 45 TFSI quattro (185 kW) (2018-2021)
  • Use: Normal
  • Capacity 10 liter
  • Check 20000 miles/ 24 months
A6 55 TFSI quattro (250 kW) (2018- )
  • Use: Normal
  • Capacity 10 liter
  • Check 20000 miles/ 24 months

Additional Notes

  • Across all listed configurations of the Audi A6, S6, and RS 6 (4A2 / 4A5, USA), the cooling system capacity is uniformly specified at 10 liters. In the context of fluid servicing, a cooling system capacity figure of this type represents the total volume of the system, meaning the amount of coolant required to fill the system completely during a full drain and refill procedure.
  • The 10-liter cooling system capacity applies equally to the A6 45 TFSI quattro at 185 kW and 195 kW output levels, the A6 55 TFSI quattro at 250 kW, the S6 TFSI quattro at 331 kW, the RS 6 TFSI quattro at 441 kW, and the RS 6 Performance TFSI quattro at 463 kW. The consistency of this figure across a wide power range — from 185 kW to 463 kW — reflects that all listed variants share the same platform cooling system architecture.
  • The A6 45 TFSI quattro is listed under two separate output ratings: 185 kW for the 2018-2021 period and 195 kW from 2021 onward. Both share identical cooling system capacity and service interval specifications, indicating that the output revision did not alter the cooling system's volume or maintenance schedule.
  • The coolant service interval across all listed configurations is specified as a check at 20,000 miles or 24 months, whichever comes first, under normal use conditions. A check interval, as distinct from a replacement interval, means the coolant level and condition are inspected at that point rather than the fluid being automatically replaced.
  • The 20,000-mile or 24-month check interval is tied specifically to normal use conditions across all six configurations. Normal use conditions generally refer to standard driving patterns without the additional thermal and mechanical stress associated with severe use, such as frequent towing, extreme temperatures, or repeated short-trip operation.
  • The RS 6 TFSI quattro at 441 kW covers the 2021-2023 model years, while the RS 6 Performance TFSI quattro at 463 kW is listed from 2023 onward. Despite the 22 kW difference in output between these two RS 6 variants, both carry the same 10-liter cooling system capacity and the same 20,000-mile or 24-month check interval under normal use.
  • The S6 TFSI quattro at 331 kW, introduced from 2019, shares the same cooling system specifications as the higher-output RS 6 variants. The 10-liter capacity figure for a turbocharged V8 application such as the RS 6 and for a turbocharged inline-six application such as the S6 reflects that total system volume is determined by the full circuit — including the radiator, heater core, expansion tank, and associated hoses — rather than engine displacement alone.

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