BMW 8 series Convertible, G14 / F91 (USA)

Transfer case fluid capacity & service interval

BMW 8 series Convertible, G14 / F91 (USA) requires 0,7 liter of transfer case fluid. Service intervals occur every 50000 miles. The data covers 5 configurations.

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

TypeSpecifications
M8 Competition xDrive Convertible (2020- )
  • Use: Flexible (on board maintenance system)
  • Capacity 0,7 liter
  • Code: ATC 13
840i xDrive Convertible (2019- )
  • Use: Normal
  • Capacity 0,7 liter
  • Code: ATC-13-1
M8 xDrive Convertible (2019- )
  • Use: Normal
  • Capacity 0,7 liter
  • Change 50000 miles
  • Code: ATC-13-1
M850i xDrive Convertible (2019- )
  • Use: Normal
  • Capacity 0,7 liter
  • Code: ATC-13-1
M850i xDrive Convertible (2018-2019)
  • Use: Normal
  • Capacity 0,7 liter
  • Code: ATC-13-1

Additional Notes

  • Across all five configurations of the BMW 8 Series Convertible (G14 / F91) covered here, the transfer case fluid capacity is uniformly 0.7 liter, indicating a compact unit consistent with a service fill rather than a full overhaul quantity.
  • The M8 xDrive Convertible starting from 2019 is the only configuration in the dataset that carries an explicit fluid change interval, set at 50,000 miles under normal use conditions.
  • The M8 Competition xDrive Convertible starting from 2020 operates under a flexible interval tied to the on-board maintenance system, meaning the vehicle's own monitoring determines when a fluid change is due rather than a fixed mileage figure.
  • The 840i xDrive Convertible starting from 2019 and the M8 xDrive Convertible starting from 2019 both share the 0.7 liter capacity under normal use, yet only the M8 xDrive carries a stated mileage interval alongside that capacity figure.
  • The M850i xDrive Convertible appears across two separate specification entries: one covering 2018-2019 and another starting from 2019, both listing 0.7 liter under normal use conditions with no change interval stated in either entry.

Other Systems