Opel Admiral

Automatic transmission fluid capacity & service interval

Opel Admiral automatic transmission fluid capacity ranges from 2,5 to 4,5 liters. Service intervals include checking every 10000 km or 6 months and changing every 30000 to 40000 km or 24 months. The data covers 4 configurations.

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

TypeSpecifications
Admiral 2.8 E (1969-1977)
  • Use: Normal
  • Capacity 2,5 liter
  • Check 10000 km/ 6 months
  • Change 40000 km/ 24 months
  • Code: THM 180 3/1
Admiral 2.8 H (1969-1977)
  • Use: Normal
  • Capacity 2,5 liter
  • Check 10000 km/ 6 months
  • Change 40000 km/ 24 months
  • Code: THM 180 3/1
Admiral 2.8 S (1969-1977)
  • Use: Normal
  • Capacity 2,5 liter
  • Check 10000 km/ 6 months
  • Change 40000 km/ 24 months
  • Code: THM 180 3/1
Admiral 2.8 (1966-1968)
  • Use: Normal
  • Capacity 4,5 liter
  • Check 10000 km
  • Change 30000 km
  • Code: THM 180 3/1

Additional Notes

  • The Opel Admiral 2.8 from 1966-1968 carries an automatic transmission fluid capacity of 4.5 liters, which is notably higher than the 2.5-liter figure shared by all three 1969-1977 variants. A larger fill volume in an automatic transmission typically reflects a bigger fluid sump or a design that retains more fluid within the torque converter circuit.
  • The drop from 4.5 liters to 2.5 liters between the 1966-1968 and 1969-1977 generations points to a meaningful difference in transmission design or sump configuration across those two production periods.
  • The Admiral 2.8 E, 2.8 H, and 2.8 S variants from 1969-1977 all share an identical automatic transmission fluid capacity of 2.5 liters, along with the same check and change intervals, indicating a common transmission unit across those three trim levels.
  • For the 1966-1968 Admiral 2.8, the fluid check interval is set at 10,000 km under normal use conditions, with a change interval of 30,000 km. No time-based interval accompanies either figure for that generation.
  • The 1969-1977 variants introduce a dual-trigger service schedule, where the fluid check falls due at 10,000 km or 6 months, and the fluid change at 40,000 km or 24 months, whichever comes first under normal use conditions. The addition of a time-based threshold alongside the distance figure means calendar time alone can trigger service even when mileage accumulation is low.
  • The change interval for the 1969-1977 Admiral 2.8 E, 2.8 H, and 2.8 S is 40,000 km or 24 months, which is 10,000 km longer than the 30,000 km interval specified for the earlier 1966-1968 Admiral 2.8.

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