Audi A8, S8, 4E (USA)

Coolant capacity & service interval

Audi A8, S8, 4E (USA) coolant capacity ranges from 9 to 18,9 liters. Service intervals consist of checks at 15000 or 20000 miles, or every 12 to 24 months. The data covers 16 configurations.

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

TypeSpecifications
A8 4.2 V8 quattro (257 kW) (2007-2010)
  • Use: Normal
  • Capacity 12 liter
  • Check 20000 miles/ 12 months
A8 4.2 V8 quattro (257 kW) (2007-2010)
  • Use: First check only
  • Capacity 12 liter
  • Check 15000 miles/ 12 months
A8 6.0 W12 quattro (331 kW) (2007-2009)
  • Use: Normal
  • Capacity 18,9 liter
  • Check 20000 miles/ 24 months
A8 6.0 W12 quattro (331 kW) (2007-2009)
  • Use: First check only
  • Capacity 18,9 liter
  • Check 15000 miles/ 24 months
S8 5.2 V10 FSI quattro (331 kW) (2007-2009)
  • Use: Normal
  • Capacity 15,6 liter
  • Check 20000 miles/ 24 months
S8 5.2 V10 FSI quattro (331 kW) (2007-2009)
  • Use: First check only
  • Capacity 15,6 liter
  • Check 15000 miles/ 24 months
A8 4.2 V8 quattro (257 kW) (2006-2007)
  • Use: Normal
  • Capacity 12 liter
  • Check 20000 miles/ 12 months
A8 4.2 V8 quattro (257 kW) (2006-2007)
  • Use: First check only
  • Capacity 12 liter
  • Check 15000 miles/ 12 months
S8 5.2 V10 FSI quattro (331 kW) (2006-2007)
  • Use: Normal
  • Capacity 15,6 liter
  • Check 20000 miles/ 12 months
S8 5.2 V10 FSI quattro (331 kW) (2006-2007)
  • Use: First check only
  • Capacity 15,6 liter
  • Check 15000 miles/ 12 months
A8 4.2 V8 quattro (246 kW) (2005-2006)
  • Use: Normal
  • Capacity 14 liter
  • Check 20000 miles/ 12 months
A8 4.2 V8 quattro (246 kW) (2005-2006)
  • Use: First check only
  • Capacity 14 liter
  • Check 15000 miles/ 12 months
A8 6.0 W12 quattro (331 kW) (2004-2007)
  • Use: Normal
  • Capacity 18,9 liter
  • Check 20000 miles/ 12 months
A8 6.0 W12 quattro (331 kW) (2004-2007)
  • Use: First check only
  • Capacity 18,9 liter
  • Check 15000 miles/ 12 months
A8 4.2 V8 quattro (246 kW) (2002-2005)
  • Use: Normal
  • Capacity 9-14 liter
  • Check 20000 miles/ 12 months
A8 4.2 V8 quattro (246 kW) (2002-2005)
  • Use: First check only
  • Capacity 9-14 liter
  • Check 15000 miles/ 12 months

Additional Notes

  • The Audi A8 4.2 V8 quattro (246 kW) covering 2002-2005 carries a capacity range of 9-14 liters rather than a fixed value, which reflects variability in the total cooling system fill depending on how much fluid remains in the system during a service top-up versus a full drain and refill.
  • From 2005-2006, the same 4.2 V8 246 kW configuration settles at a fixed 14-liter capacity, eliminating the lower bound seen in the earlier 2002-2005 range and suggesting a standardized full-system fill figure for that production period.
  • The 4.2 V8 257 kW variant, covering 2006-2010, specifies a 12-liter capacity, which is lower than the 14-liter figure associated with the 246 kW version of the same displacement, indicating a difference in cooling circuit volume between the two power outputs.
  • The A8 6.0 W12 quattro (331 kW) carries the largest cooling system capacity in the lineup at 18.9 liters, consistent with the thermal demands of a W12 engine, which combines two narrow-angle VR6 banks and requires a more extensive coolant circuit than a conventional V8.
  • The S8 5.2 V10 FSI quattro (331 kW) specifies a 15.6-liter cooling system capacity, placing it between the V8 and W12 figures and reflecting the greater cylinder count and heat rejection requirements of a naturally aspirated V10 compared to the V8 configurations.
  • Across all configurations covering 2002-2007, the standard coolant check interval is 20,000 miles or 12 months under normal use conditions, with the first check only interval set at 15,000 miles or 12 months, meaning the initial service occurs earlier than subsequent ones.
  • The "first check only" designation applies a shorter mileage threshold of 15,000 miles compared to the 20,000-mile normal interval, a practice associated with verifying coolant level and condition after initial break-in or following a service event where the system was opened.
  • For the W12 and V10 configurations from 2007 onward, the time-based component of the check interval extends from 12 months to 24 months while the mileage thresholds remain unchanged at 20,000 miles for normal use and 15,000 miles for the first check only, doubling the maximum allowable time between inspections regardless of mileage.
  • The 2006-2007 S8 5.2 V10 FSI quattro retains the 12-month time interval shared with the earlier V8 and W12 entries, while the same V10 engine in 2007-2009 production shifts to the 24-month interval, mirroring the change seen in the W12 for the same period.

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