Opel Commodore C

Differential fluid capacity & service interval

Opel Commodore C differential fluid capacity is 1,4 liters. Service intervals include normal use. The data covers 4 configurations.

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

TypeSpecifications
  • Commodore 2.5 E (1977-1982)
  • Rear
  • Use: Normal
  • Capacity 1,4 liter
  • Commodore 2.5 E (1977-1982)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1,4 liter
  • Commodore 2.5 S (1977-1982)
  • Rear
  • Use: Normal
  • Capacity 1,4 liter
  • Commodore 2.5 S (1977-1982)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1,4 liter

Additional Notes

  • The Opel Commodore C rear differential capacity is 1.4 liters across all listed configurations, covering both the 2.5 E and 2.5 S engine variants for the 1977-1982 model years.
  • The 1.4-liter figure applies to service fill conditions under normal use, meaning routine maintenance rather than a full overhaul or dry-fill scenario.
  • Both the standard rear differential and the limited slip rear differential share the same 1.4-liter capacity on the 2.5 E, indicating no volumetric difference between the two axle types on that variant.
  • The same capacity parity between standard and limited slip differentials is present on the 2.5 S, where both rear differential configurations also hold 1.4 liters under normal use conditions.
  • A limited slip differential, as a unit type, typically requires a fluid with friction modifier additives to function correctly, and the presence of a limited slip listing as a separate row reflects a mechanically distinct axle despite the shared 1.4-liter capacity.

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