Audi A4, S4, 8K / B8 (USA)

Transfer case fluid capacity & service interval

Audi A4, S4, 8K / B8 (USA) transfer case fluid capacity is 1 liter. Service intervals include checks at 15000 miles or 12 months, 15000 miles or 24 months, 20000 miles or 12 months, and 20000 miles or 24 months. The data covers 12 configurations.

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

TypeSpecifications
A4 2.0 TFSI quattro (162 kW) (2013-2016)
  • Use: Normal
  • Capacity 1 liter
  • Check 20000 miles/ 24 months
A4 2.0 TFSI quattro (162 kW) (2013-2016)
  • Use: First check only
  • Capacity 1 liter
  • Check 15000 miles/ 24 months
A4 Avant quattro 2.0 TFSI (162 kW) (2013-2016)
  • Use: Normal
  • Capacity 1 liter
  • Check 20000 miles/ 24 months
A4 Avant quattro 2.0 TFSI (162 kW) (2013-2016)
  • Use: First check only
  • Capacity 1 liter
  • Check 15000 miles/ 24 months
A4 2.0 TFSI quattro (155 kW) (2010-2013)
  • Use: Normal
  • Capacity 1 liter
  • Check 20000 miles/ 12 months
A4 2.0 TFSI quattro (155 kW) (2010-2013)
  • Use: First check only
  • Capacity 1 liter
  • Check 15000 miles/ 12 months
A4 Avant quattro 2.0 TFSI (155 kW) (2010-2013)
  • Use: Normal
  • Capacity 1 liter
  • Check 20000 miles/ 12 months
A4 Avant quattro 2.0 TFSI (155 kW) (2010-2013)
  • Use: First check only
  • Capacity 1 liter
  • Check 15000 miles/ 12 months
A4 2.0 TFSI quattro (155 kW) (2008-2010)
  • Use: Normal
  • Capacity 1 liter
  • Check 20000 miles/ 12 months
A4 2.0 TFSI quattro (155 kW) (2008-2010)
  • Use: First check only
  • Capacity 1 liter
  • Check 15000 miles/ 12 months
A4 Avant quattro 2.0 TFSI (155 kW) (2008-2010)
  • Use: Normal
  • Capacity 1 liter
  • Check 20000 miles/ 12 months
A4 Avant quattro 2.0 TFSI (155 kW) (2008-2010)
  • Use: First check only
  • Capacity 1 liter
  • Check 15000 miles/ 12 months

Additional Notes

  • The transfer case fluid capacity across all listed Audi A4 8K/B8 quattro configurations is 1 liter. A 1-liter fill is characteristic of a compact, single-speed transfer case unit rather than a larger multi-speed transfer case, which typically holds significantly more fluid.
  • All configurations carry two distinct check intervals: a first check only interval at 15,000 miles and a normal interval at 20,000 miles. The first check only condition applies exclusively to the initial service event, after which the standard 20,000-mile normal interval governs subsequent checks.
  • The 155 kW variants covering 2008-2013 pair both the 15,000-mile first check and the 20,000-mile normal check with a 12-month time limit. The time component means whichever threshold is reached first, mileage or calendar duration, triggers the service.
  • The 162 kW variants introduced for 2013-2016 extend the time component of both check intervals from 12 months to 24 months, while the mileage thresholds of 15,000 miles and 20,000 miles remain unchanged from the earlier 155 kW specifications.
  • The 24-month time allowance on the 162 kW A4 2.0 TFSI quattro and A4 Avant quattro means a vehicle accumulating low annual mileage can go up to two years between transfer case fluid checks under normal use conditions, compared to the one-year ceiling on the 155 kW variants.
  • Sedan and Avant (wagon) body variants sharing the same engine output and model year range carry identical transfer case fluid capacities and check intervals, indicating no body-style-specific variation in transfer case service requirements within the same powertrain generation.
  • The 2010-2013 155 kW configurations retain the same 1-liter capacity and 12-month/15,000-mile first check plus 12-month/20,000-mile normal check structure as the 2008-2010 155 kW configurations, showing no change in transfer case service specifications across that powertrain revision boundary.

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