Pontiac Fiero

Automatic transmission fluid capacity & service interval

Pontiac Fiero automatic transmission fluid specifications cover normal use with a capacity of 3.8 liters for service fill and 4.7 liters for overhaul capacity. The data includes two configurations.

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

TypeSpecifications
Fiero 2.5 (1984-1988)
  • Use: Normal
  • Capacity 4,7 liter (Overhaul capacity)
  • Capacity 3,8 liter (Service fill)
  • Code: 3/1
Fiero 2.8 V6 (1984-1988)
  • Use: Normal
  • Capacity 4,7 liter (Overhaul capacity)
  • Capacity 3,8 liter (Service fill)
  • Code: 3/1

Additional Notes

  • The Pontiac Fiero carries an automatic transaxle rather than a conventional transmission, reflecting the mid-engine, rear-wheel-drive layout where the gearbox and final drive are combined into a single rear-mounted unit.
  • Both the 2.5-liter four-cylinder and the 2.8-liter V6 configurations share identical automatic transaxle fluid capacities across the 1984-1988 model years, with no variation between engine types.
  • The service fill capacity for the automatic transaxle is 3.8 liters, representing the amount of fluid needed when draining and refilling during routine maintenance without fully disassembling the unit.
  • The overhaul capacity is rated at 4.7 liters, which is the total fluid volume required when the transaxle is completely disassembled, cleaned, and rebuilt, accounting for fluid retained in passages and components that a simple drain does not evacuate.
  • The difference of 0.9 liters between the overhaul capacity and the service fill capacity reflects the residual fluid that remains trapped inside the transaxle during a standard drain procedure.
  • All capacity figures listed apply under normal use conditions, meaning neither the 2.5-liter nor the 2.8 V6 specification carries a separate severe-duty interval or capacity distinction.

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