BMW 2.5, 2800, 3.0 CS/CSi, E9 (EU)

Automatic transmission fluid capacity & service interval

BMW 2.5, 2800, 3.0 CS/CSi, E9 (EU) models require automatic transmission fluid with a capacity range of 5,8 to 7,6 liters. Service intervals include a check every 12000 km. The data covers 4 configurations.

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

TypeSpecifications
2.5 CS (1974-1975)
  • Use: Normal
  • Capacity 5,8 liter (Dry fill)
  • Check 12000 km
  • Code: ZF 3HP-20 3/1
3.0 CSi (1972-1975)
  • Use: Normal
  • Capacity 7,6 liter (Dry fill)
  • Check 12000 km
  • Code: ZF BW 65 3/1
3.0 CS (1971-1975)
  • Use: Normal
  • Capacity 7,6 liter (Dry fill)
  • Check 12000 km
  • Code: ZF BW 65 3/1
2800 CS (1968-1971)
  • Use: Normal
  • Capacity 6,4 liter (Dry fill)
  • Check 12000 km
  • Code: ZF 3HP-20 3/1

Additional Notes

  • All four configurations carry a dry fill designation, meaning the listed capacities reflect a fully drained and rebuilt transmission rather than a routine fluid top-up or partial drain-and-fill service.
  • The BMW 2.5 CS, produced in 1974-1975, holds 5.8 liters of automatic transmission fluid at dry fill, the smallest capacity among the E9 variants listed.
  • The 2800 CS (1968-1971) specifies a dry fill capacity of 6.4 liters, placing it between the 2.5 CS and the larger-displacement 3.0-liter variants.
  • Both the 3.0 CS (1971-1975) and 3.0 CSi (1972-1975) share an identical dry fill capacity of 7.6 liters, the highest figure across all four configurations.
  • The 7.6-liter dry fill figure for the 3.0 CS and 3.0 CSi represents a notable increase over the 2800 CS, reflecting the larger displacement and associated drivetrain demands of those variants.
  • A 12,000 km check interval applies uniformly across all four configurations under normal use conditions, indicating that fluid level inspection was scheduled at that mileage regardless of engine size or model year.
  • The normal use condition tied to the 12,000 km check interval distinguishes routine driving from more demanding operating conditions, and all four rows are specified exclusively under that classification.

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