Opel Commodore C

Manual transmission fluid capacity & service interval

Opel Commodore C manual transmission fluid capacity is 1,1 liter. Service intervals include normal use. The data covers 2 configurations.

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

TypeSpecifications
Commodore 2.5 E (1977-1982)
  • Use: Normal
  • Capacity 1,1 liter
  • Code: 4/1
Commodore 2.5 S (1977-1982)
  • Use: Normal
  • Capacity 1,1 liter
  • Code: 4/1

Additional Notes

  • The Opel Commodore C manual transmission holds 1.1 liters of fluid across both the 2.5 E and 2.5 S variants, covering the full 1977-1982 model range.
  • A 1.1-liter fill is a relatively modest capacity, consistent with compact manual gearboxes of the era, where smaller fluid volumes were standard for four- and five-speed units in mid-size European vehicles.
  • Both the 2.5 E and 2.5 S share an identical 1.1-liter manual transmission capacity, indicating no mechanical differentiation between the two trim levels at the gearbox level.
  • The capacity figure of 1.1 liters applies under normal use conditions, meaning the specification reflects routine service fills rather than a post-overhaul or dry-fill scenario, which would typically require a higher volume to account for residual fluid loss during disassembly.

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