Mazda Cosmo/121 (EU)

Automatic transmission fluid capacity & service interval

Mazda Cosmo/121 (EU) automatic transmission fluid capacity is 6,2 liters. Service intervals consist of checks every 10000 km or 6 months. The data covers 2 configurations.

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

TypeSpecifications
Cosmo/121 1800, CD (1975-1981)
  • Use: Normal
  • Capacity 6,2 liter
  • Check 10000 km/ 6 months
  • Code: 3/1
Cosmo/121 2000, CD (1975-1981)
  • Use: Normal
  • Capacity 6,2 liter
  • Check 10000 km/ 6 months
  • Code: 3/1

Additional Notes

  • Both the 1800 and 2000 engine variants of the Mazda Cosmo/121 CD share an identical automatic transmission fluid capacity of 6.2 liters, covering the 1975-1981 model years.
  • A 6.2-liter automatic transmission fluid capacity is relatively substantial for passenger vehicles of that era, which is consistent with the larger, multi-stage automatic gearboxes common in the mid-to-late 1970s.
  • The service interval for both configurations specifies a fluid check at every 10,000 km or every 6 months, whichever comes first, under normal use conditions.
  • The dual-trigger interval structure, combining a distance threshold with a time-based limit, reflects a standard practice for automatic transmission maintenance where driving frequency and elapsed time are both considered relevant factors.
  • The identical capacity and check interval across the 1800 and 2000 engine variants suggests both displacements were paired with the same automatic transmission unit during the 1975-1981 production period.

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