Innocenti A40

Differential fluid capacity & service interval

Innocenti A40 differential fluid capacity is 1 liter. Service intervals include checking at 4000 km and changing at 20000 km. The data covers 2 configurations.

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

TypeSpecifications
  • A40S (1962-1967)
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Check 4000 km
  • Change 20000 km
  • A40 (1959-1961)
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Check 4000 km
  • Change 20000 km

Additional Notes

  • The Innocenti A40 rear differential holds 1 liter of fluid, a figure that applies to a service fill rather than a full overhaul, as the housing retains residual fluid during a standard drain.
  • The A40 (1959-1961) rear differential follows a normal-use check interval of 4,000 km, meaning the fluid level is inspected at that mileage under typical operating conditions rather than under severe or demanding use.
  • The change interval for the A40 (1959-1961) rear differential under normal use is set at 20,000 km, which is a relatively extended drain cycle consistent with the lower thermal and mechanical stress placed on a rear differential compared to engine oil.
  • The A40S (1962-1967) rear differential carries the same 1-liter capacity as the earlier A40, with identical check and change intervals of 4,000 km and 20,000 km respectively under normal use conditions.

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