Audi 100, F104 (EU)

Coolant capacity & service interval

Audi 100, F104 (EU) coolant specifications cover a fluid capacity range of 7 to 7.5 liters. The data includes 9 different configurations.

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

TypeSpecifications
100 L (1974-1976)
  • Use: Normal
  • Capacity 7,5 liter
100 (1971-1974)
  • Use: Normal
  • Capacity 7,5 liter
100 Coupé S (1971-1976)
  • Use: Normal
  • Capacity 7 liter
100 LS (63 kW) (1971-1974)
  • Use: Normal
  • Capacity 7,5 liter
100 Coupé S (1970-1971)
  • Use: Normal
  • Capacity 7 liter
100 GL (1970-1976)
  • Use: Normal
  • Capacity 7,5 liter
100 (1968-1971)
  • Use: Normal
  • Capacity 7,5 liter
100 LS (74 kW) (1968-1971)
  • Use: Normal
  • Capacity 7,5 liter
100 S (1968-1971)
  • Use: Normal
  • Capacity 7,5 liter

Additional Notes

  • Across the Audi 100 F104 range, cooling system capacities fall into two distinct values: 7.5 liters and 7.0 liters. The 7.5-liter figure applies to the sedan-based variants, while the 7.0-liter figure is specific to the 100 Coupé S across both its 1970-1971 and 1971-1976 production periods.
  • The 0.5-liter difference between the Coupé S and the sedan variants reflects a smaller total coolant volume in the Coupé S body configuration, which typically corresponds to a slightly different engine bay layout or radiator sizing rather than a different engine displacement.
  • The 100 LS was produced in two distinct output ratings within the F104 generation: a 63 kW version covering 1971-1974 and a 74 kW version covering 1968-1971. Both share the same 7.5-liter cooling system capacity despite the difference in power output.
  • All cooling system capacities listed represent full system fills under normal use conditions, meaning the figures account for the radiator, engine block passages, heater core circuit, and any overflow or expansion volume included in the system design of that era.
  • The 100 GL (1970-1976) and 100 L (1974-1976) both carry the 7.5-liter capacity, consistent with the broader sedan-based variants in the F104 lineup across the same period.
  • The base 100 and 100 S variants from 1968-1971 each specify 7.5 liters, and the 100 sedan continues with the same 7.5-liter figure through the 1971-1974 period, indicating no change in cooling system volume across that model year transition.

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