BMW Z4 Roadster, G29 (USA)

Differential fluid capacity & service interval

BMW Z4 Roadster, G29 (USA) models utilize differential fluid with a capacity range of 0,8 to 1 liter. The data covers 5 configurations.

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

TypeSpecifications
  • Z4 Roadster M40i (2019- )
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Code: HAG 215LWS
  • Z4 Roadster sDrive30i (2019- )
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Code: 215 LWS SA2T4
  • Z4 Roadster sDrive30i (2019- )
  • Rear, as of 03/2020
  • Use: Normal
  • Capacity 0,8 liter
  • Code: 190AL
  • Z4 Roadster sDrive30i (2019- )
  • Rear, up to 02/2020
  • Use: Normal
  • Capacity 0,8 liter
  • Code: 190AL
  • Z4 Roadster M40i (2018-2019)
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Code: HAG 215LWS

Additional Notes

  • The BMW Z4 Roadster G29 rear differential fluid capacity is listed at 1 liter across both the M40i and the sDrive30i configurations, at least for the production periods where that figure applies.
  • The M40i carries a 1-liter rear differential capacity for the 2018-2019 model year entry, and a separate row covering production starting in 2019 lists the same 1-liter figure, meaning no capacity change is recorded between those two entries.
  • For the sDrive30i, a capacity of 0.8 liter is specified for units produced up to 02/2020, indicating a mid-production revision occurred within the 2019-onward range rather than at a model year boundary.
  • A second sDrive30i row also lists 0.8 liter for units produced as of 03/2020, confirming the revised capacity figure carried forward from that production date.
  • The presence of both a "up to 02/2020" and an "as of 03/2020" entry for the sDrive30i rear differential reflects a production-date-based split, a format used when a specification change occurs mid-run and both pre- and post-change vehicles require distinct service data.
  • All rows across both trims are designated for normal use conditions, meaning no separate severe-use interval or capacity figure is listed for the rear differential on either the M40i or the sDrive30i.
  • The 0.2-liter difference between the earlier 1-liter sDrive30i figure and the later 0.8-liter figure is meaningful at the service level, since overfilling a differential beyond its specified capacity can cause fluid aeration and seal pressure issues.