BMW Z4 Roadster, E85 (USA)

Differential fluid capacity & service interval

BMW Z4 Roadster, E85 (USA) uses differential fluid with a capacity of 1.2 liters. The data covers 9 configurations.

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

TypeSpecifications
  • Z4 3.0i (2005-2008)
  • Rear
  • Use: Normal
  • Capacity 1,2 liter
  • Z4 3.0i (2005-2008)
  • Rear, with differential lock
  • Use: Normal
  • Capacity 1,2 liter
  • Z4 3.0si (2005-2008)
  • Rear
  • Use: Normal
  • Capacity 1,2 liter
  • Z4 3.0si (2005-2008)
  • Rear, with differential lock
  • Use: Normal
  • Capacity 1,2 liter
  • Z4 M Roadster (2005-2008)
  • Rear, with differential lock
  • Use: Normal
  • Capacity 1,2 liter
  • Z4 2.5i (2002-2006)
  • Rear
  • Use: Normal
  • Capacity 1,2 liter
  • Z4 2.5i (2002-2006)
  • Rear, with differential lock
  • Use: Normal
  • Capacity 1,2 liter
  • Z4 3.0i (2002-2006)
  • Rear
  • Use: Normal
  • Capacity 1,2 liter
  • Z4 3.0i (2002-2006)
  • Rear, with differential lock
  • Use: Normal
  • Capacity 1,2 liter

Additional Notes

  • A 1.2-liter differential fluid capacity applies uniformly across all BMW Z4 Roadster E85 configurations covered in the specifications, spanning the 2.5i, 3.0i, 3.0si, and M Roadster variants from 2002-2008.
  • In rear differential service, a capacity figure of 1.2 liters is consistent with a service fill measurement, representing the amount of fluid required when refilling a unit already drained rather than a full overhaul disassembly volume.
  • The Z4 2.5i and the early Z4 3.0i share the same 2002-2006 production window and both carry the identical 1.2-liter rear differential capacity, whether or not the differential lock option is present.
  • A separate 3.0i specification entry covers 2005-2008, meaning the 3.0i engine appeared across two overlapping specification periods, yet the rear differential capacity of 1.2 liters remained unchanged between the earlier and later 3.0i entries.
  • The differential lock variant is listed as a distinct configuration for the 2.5i, 3.0i, 3.0si, and M Roadster, yet in every case the fluid capacity of 1.2 liters matches the standard non-locking rear differential, indicating the locking mechanism does not alter the housing's fluid volume requirement.
  • All specifications are designated for normal use conditions, meaning the capacity and service parameters listed apply to standard operating environments rather than severe-duty or motorsport-level service cycles.
  • The Z4 M Roadster, covering 2005-2008, is listed exclusively with the differential lock configuration, and no separate standard rear differential entry without the lock appears in the specifications for that variant.
  • The 3.0si, introduced in the 2005-2008 range, carries the same 1.2-liter rear differential capacity as the 3.0i variants, despite representing a higher-output engine designation within the E85 lineup.

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