Audi A8L, S8L, 4N / 4NL (USA)

Brake fluid capacity & service interval

Audi A8L, S8L, 4N / 4NL (USA) models require 1 liter of brake fluid. Service intervals include checking every 10000 miles or 12 months and changing every 24 months. The data covers 5 configurations.

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

TypeSpecifications
S8L 4.0 TFSI quattro (420 kW) (2022- )
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A8L 60 TFSI e quattro (330 kW) (2019-2022)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A8L 55 TFSI quattro (250 kW) (2018- )
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A8L 60 TFSI quattro (337 kW) (2018-2022)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
S8L 4.0 TFSI quattro (420 kW) (2018-2022)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months

Additional Notes

  • The Audi A8L, S8L, 4N / 4NL (USA) brake fluid system carries a capacity of 1 liter across all listed configurations, which is a typical reservoir volume for a hydraulic brake system in a full-size luxury sedan.
  • The A8L 55 TFSI quattro (250 kW), A8L 60 TFSI quattro (337 kW), and S8L 4.0 TFSI quattro (420 kW) all share an identical service structure: a check interval of 10,000 miles or 12 months and a fluid change interval of 24 months under normal use conditions.
  • The A8L 60 TFSI e quattro (330 kW), a plug-in hybrid variant, carries the same 1-liter capacity and the same 10,000-mile or 12-month check interval as the non-hybrid configurations, with a fluid change also set at 24 months under normal use.
  • A 24-month brake fluid change interval is time-based rather than mileage-based, which reflects the hygroscopic nature of brake fluid — meaning the fluid absorbs moisture from the atmosphere over time, lowering its boiling point regardless of how many miles have been driven.
  • The check interval of 10,000 miles or 12 months uses an "or" condition, meaning whichever threshold is reached first triggers the inspection, not the combination of both.
  • The S8L 4.0 TFSI quattro (420 kW) appears under two separate year range entries — 2018-2022 and a second entry starting from 2022 — both specifying the same 1-liter capacity, check interval, and 24-month change interval under normal use conditions.

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