BMW 6 series, E63 / E64 (USA)

Automatic transmission fluid capacity & service interval

BMW 6 series, E63 / E64 (USA) automatic transmission fluid capacity ranges from 2,55 to 10 liters. The service interval is 100000 miles. The data covers 3 configurations.

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

TypeSpecifications
650i (2005-2011)
  • Use: Normal
  • Capacity 9,5-10 liter
  • Change 100000 miles
  • Code: ZF 6HP26 6/1
M6 (2004-2011)
  • Use: Normal
  • Capacity 2,75 liter (Initial fill)
  • Capacity 2,55 liter (Service fill)
  • Code: Getrag GS7S47BG 7/1
645Ci (2003-2005)
  • Use: Normal
  • Capacity 9,4-10 liter
  • Change 100000 miles
  • Code: ZF 6HP26 6/1

Additional Notes

  • The BMW 6 Series E63/E64 645Ci carries an automatic transmission fluid capacity of 9.4 to 10 liters, reflecting a range typical of full system fills that account for fluid retained in the torque converter and cooler lines.
  • The 650i shares a nearly identical capacity range of 9.5 to 10 liters, placing both the 645Ci and 650i in close alignment despite representing different engine generations within the E63/E64 lineup.
  • Both the 645Ci and 650i carry a 100,000-mile change interval under normal use conditions, which in automatic transmission service generally refers to standard driving without sustained towing, extreme heat, or repeated stop-and-go operation.
  • The M6 uses a semi-automatic transmission rather than a conventional automatic, and its fluid capacity figures are specified separately as an initial fill of 2.75 liters and a service fill of 2.55 liters.
  • The distinction between the M6's initial fill and service fill values indicates that a first-time fill from a dry state requires slightly more fluid than a routine drain-and-refill service, where residual fluid remains in the system.
  • At 2.55 to 2.75 liters, the M6's semi-automatic transmission holds considerably less fluid than the 9.4 to 10-liter capacity of the conventional automatics in the 645Ci and 650i, consistent with the fundamentally different mechanical architecture of a semi-automatic unit.
  • No change interval is listed for the M6's semi-automatic transmission, whereas the 645Ci and 650i both carry the 100,000-mile normal-use interval as their specified service benchmark.

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