Opel Diplomat A

Automatic transmission fluid capacity & service interval

Opel Diplomat A automatic transmission fluid capacity ranges from 2,5 to 7 liters. Service intervals include 10000 km or 6 months for checks, and 20000 km or 40000 km or 24 months for changes. The data covers 2 configurations.

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

TypeSpecifications
Diplomat A 5.4 V8 (1965-1968)
  • Use: Normal
  • Capacity 7 liter (Dry fill)
  • Capacity 2,5 liter (Service fill)
  • Check 10000 km/ 6 months
  • Change 40000 km/ 24 months
  • Code: 2/1
Diplomat A 4.6 V8 (1964-1968)
  • Use: Normal
  • Capacity 7 liter (Dry fill)
  • Capacity 2,5 liter (Service fill)
  • Change 20000 km
  • Code: 2/1

Additional Notes

  • The Opel Diplomat A 4.6 V8 carries a dry fill capacity of 7 liters, which represents the total fluid volume required when filling a completely drained or rebuilt transmission from empty.
  • The service fill capacity for the 4.6 V8 is 2.5 liters, a significantly lower figure that reflects only the partial volume displaced during a routine fluid change where residual fluid remains in the torque converter and passages.
  • The 4.6 V8 automatic transmission fluid change interval is set at 20,000 km under normal use conditions.
  • The 5.4 V8 shares the same 7-liter dry fill and 2.5-liter service fill capacities as the 4.6 V8, meaning both engine variants use the same transmission fluid volume specifications despite differing in displacement.
  • The 5.4 V8 carries a fluid level check interval of 10,000 km or 6 months under normal use conditions, a periodic inspection point separate from the full fluid change schedule.
  • The fluid change interval for the 5.4 V8 is 40,000 km or 24 months under normal use conditions, double the 20,000 km interval specified for the 4.6 V8.
  • The 5.4 V8 was introduced in 1965, one year after the 4.6 V8, and both variants ran through 1968 within the Diplomat A generation.

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