BMW 3 series, G20 / G80 (USA)

Transfer case fluid capacity & service interval

BMW 3 series, G20 / G80 (USA) requires transfer case fluid with a capacity of 0,7 liter. The data covers 3 configurations.

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

TypeSpecifications
M340i xDrive Mild-Hybrid (2024- )
  • Use: Normal
  • Capacity 0,7 liter
  • Code: ATC-13-1
M340i xDrive Mild-Hybrid (2020-2024)
  • Use: Normal
  • Capacity 0,7 liter
  • Code: ATC-13-1
M340i xDrive (2019-2020)
  • Use: Normal
  • Capacity 0,7 liter
  • Code: ATC-13-1

Additional Notes

  • The BMW 3 Series G20/G80 M340i xDrive transfer case holds 0.7 liter of fluid across all listed configurations, covering the standard M340i xDrive from 2019-2020, the Mild-Hybrid variant from 2020-2024, and the Mild-Hybrid from 2024 onward.
  • A 0.7 liter capacity is a relatively small fill volume, consistent with compact transfer case units found in longitudinally mounted all-wheel drive systems where the transfer case is a sealed, self-contained assembly rather than a shared sump.
  • All three configurations carry a "normal" use condition designation, meaning the 0.7 liter figure applies to standard operating conditions rather than severe-duty or first-change-only scenarios.
  • The capacity value remains identical between the non-hybrid M340i xDrive (2019-2020) and the Mild-Hybrid M340i xDrive variants, indicating no change in transfer case fluid volume despite the powertrain revision introduced with the Mild-Hybrid system.

Other Systems