BMW i8, I12 (USA)

Automatic transmission fluid capacity & service interval

BMW i8, I12 (USA) models utilize automatic transmission fluid with a capacity of 5,5 liters. The data covers 3 configurations.

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

TypeSpecifications
i8 (2019-2020)
  • Use: Normal
  • Capacity 5,5 liter
  • Code: GA6F21AW (Aisin) 6/1
i8 (2015-2019)
  • Use: Normal
  • Capacity 5,5 liter
  • Code: GA6F21AW (Aisin) 6/1
i8 (2014-2015)
  • Use: Normal
  • Capacity 5,5 liter
  • Code: GA6F21AW (Aisin) 6/1

Additional Notes

  • The BMW i8 I12 automatic transaxle carries a fluid capacity of 5.5 liters across all listed model year configurations spanning 2014-2020.
  • A 5.5-liter figure for an automatic transaxle typically reflects a service fill capacity, meaning the volume required when draining and refilling during routine maintenance rather than a full overhaul fill, which would account for fluid retained in the torque converter and passages.
  • All three year groupings, 2014-2015, 2015-2019, and 2019-2020, share the same 5.5-liter capacity, indicating no revision to the transaxle fluid volume requirement occurred across the production span covered by these specifications.
  • Each configuration is designated under normal use conditions, meaning the listed 5.5-liter capacity applies to standard operating environments rather than severe-duty cycles such as frequent towing, extreme temperatures, or high-performance driving patterns.
  • The transaxle designation in all rows reflects a combined transmission and axle assembly, a layout consistent with the i8's rear-mounted electric motor drive unit, where the gearbox and differential share a common housing and fluid circuit.