Fiat 1100, 103 (EU)

Manual transmission fluid capacity & service interval

Fiat 1100, 103 (EU) manual transmission fluid capacity ranges from 1,07 to 1,1 liters. Service intervals include checking at 2500, 5000, and 10000 km, and changing at 20000 and 30000 km. The data covers 6 configurations.

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

TypeSpecifications
1100H, 103S (1967-1969)
  • Use: Normal
  • Capacity 1,1 liter
  • Check 10000 km
  • Change 30000 km
  • Code: 4/1
1100R, 103P (1966-1969)
  • Use: Normal
  • Capacity 1,1 liter
  • Check 10000 km
  • Change 30000 km
  • Code: 4/1
1100D, 103G.1 (1962-1966)
  • Use: Normal
  • Capacity 1,1 liter
  • Check 2500 km
  • Change 30000 km
  • Code: 4/1
1100, 103D (1957-1962)
  • Use: Normal
  • Capacity 1,1 liter
  • Check 5000 km
  • Change 20000 km
  • Code: 4/1
1100, 103G/H (1957-1962)
  • Use: Normal
  • Capacity 1,07 liter
  • Check 5000 km
  • Change 20000 km
  • Code: 4/1
1100, 103E (1953-1957)
  • Use: Normal
  • Capacity 1,1 liter
  • Check 5000 km
  • Change 20000 km
  • Code: 4/1

Additional Notes

  • The Fiat 1100 103G/H (1957-1962) carries a manual transmission fluid capacity of 1.07 liters, a slight reduction from the 1.1-liter figure shared by all other variants in the lineup. A difference of this magnitude typically reflects a minor internal volume change in the gearbox housing or sump design rather than a fundamental redesign.
  • The 1.1-liter capacity found across the 103D, 103E, 103G.1, 103S, and 103P variants represents a service fill volume, meaning the amount required to bring a properly drained unit back to the correct operating level rather than a full overhaul or dry-build quantity.
  • The 103E (1953-1957) and 103D (1957-1962) share identical specifications: a 1.1-liter capacity, a 5,000 km check interval, and a 20,000 km change interval under normal use conditions.
  • The 103G.1 (1962-1966) carries the most frequent check interval in the series at 2,500 km, half the 5,000 km interval of the earlier 103D and 103E. Despite the more frequent checks, the change interval for the 103G.1 extends to 30,000 km, longer than the 20,000 km drain interval specified for those earlier variants.
  • The 103S (1967-1969) and 103P (1966-1969) share a check interval of 10,000 km and a change interval of 30,000 km, both under normal use conditions. The 10,000 km check interval is the longest in the series, reflecting a progression toward less frequent maintenance requirements in later production variants.
  • Across the full 1953-1969 span of the Fiat 1100 103 series, the change interval shifts from 20,000 km in the earliest variants to 30,000 km in the later ones, while the check interval moves from 5,000 km down to 2,500 km in the 103G.1 before rising to 10,000 km in the final two variants.

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