Opel GT

Automatic transmission fluid capacity & service interval

Opel GT automatic transmission fluid capacity is 2 liters. 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
GT 1.1 (1969-1973)
  • Use: Normal
  • Capacity 2 liter
  • Code: THM 180 3/1
GT 1.9 (1969-1973)
  • Use: Normal
  • Capacity 2 liter
  • Code: THM 180 3/1

Additional Notes

  • Both the 1.1 and 1.9 engine variants of the Opel GT share an identical automatic transmission fluid capacity of 2 liters, indicating a common transmission unit across the two displacements offered during the 1969-1973 production span.
  • The 2-liter figure represents a service fill capacity, which typically reflects the amount of fluid needed during a routine drain-and-refill procedure rather than a full overhaul fill, where additional fluid would be required to account for the torque converter and cooler lines.
  • Both configurations carry a normal use condition designation, meaning the 2-liter capacity and associated service interval apply under standard operating conditions rather than severe or heavy-duty driving cycles.

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