BMW 6 series, E63 / E64 (EU)

Differential fluid capacity & service interval

The BMW 6 series, E63 / E64 (EU) uses differential fluid with a capacity ranging from 1 to 1.4 liters depending on the configuration. The data covers 5 different configurations.

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

TypeSpecifications
  • 630i (2007-2011)
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Code: 188L
  • 635d (2007-2011)
  • Rear
  • Use: Normal
  • Capacity 1,2-1,4 liter
  • Code: 215LW
  • 650i (2005-2011)
  • Rear
  • Use: Normal
  • Capacity 1,4 liter
  • Code: 215K
  • 630i (2004-2007)
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Code: 188L
  • 645Ci (2003-2005)
  • Rear
  • Use: Normal
  • Capacity 1,4 liter
  • Code: 215K

Additional Notes

  • The BMW 6 Series E63/E64 rear differential fluid capacity varies by engine variant, ranging from 1 liter in the 630i to 1.4 liters in the 645Ci and 650i.
  • Both the 2004-2007 and 2007-2011 630i share an identical rear differential capacity of 1 liter, indicating no change in differential unit size across the production span of the inline-six petrol variant.
  • The 635d carries a rear differential capacity listed as a range of 1.2-1.4 liters, which reflects a fill tolerance rather than a fixed volume, meaning the accepted quantity depends on the level reached at the fill plug rather than a precise target figure.
  • The 645Ci, produced from 2003-2005, specifies a rear differential capacity of 1.4 liters, matching the figure later carried over to the 650i from 2005-2011, suggesting both V8-engined variants share a comparable differential unit.
  • All five configurations across the E63/E64 range list differential fluid service under normal use conditions, meaning the specified capacities apply to standard operating environments rather than severe or track-oriented duty cycles.
  • The 1.4-liter capacity of the 645Ci and 650i rear differentials is notably higher than the 1-liter figure of the 630i, a difference consistent with the greater torque output of the V8 engine requiring a larger differential housing to manage load distribution.

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