Alfa Romeo Montreal, 105 (EU)

Manual transmission fluid capacity & service interval

Alfa Romeo Montreal and 105 (EU) manual transmission fluid capacity is 1,6 liters. Service intervals consist of a 6000 km check and an 18000 km change. The data covers 2 configurations.

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

TypeSpecifications
Montreal (1970-1977)
  • Use: Normal
  • Capacity 1,6 liter
  • Check 6000 km
  • Change 18000 km
  • Code: ZF S5-18/3 5/1
Montreal (1970-1977)
  • Use: Alternative (acceptable)
  • Capacity 1,6 liter
  • Check 6000 km
  • Change 18000 km
  • Code: ZF S5-18/3 5/1

Additional Notes

  • The Alfa Romeo Montreal 105 (EU) manual transmission holds 1.6 liters of fluid, a figure that applies consistently across both the normal and alternative (acceptable) use conditions.
  • Under normal use, the manual transmission fluid check interval is set at 6,000 km, with a full fluid change due at 18,000 km.
  • The alternative (acceptable) use condition carries identical check and change intervals — 6,000 km and 18,000 km respectively — as well as the same 1.6-liter capacity, meaning no adjustment to service frequency or fill volume is specified when using an alternative fluid.
  • A 1.6-liter transmission capacity is relatively modest and consistent with the compact, single-unit gearbox designs common in European sports cars of the early 1970s, where the transmission housing volume was tightly constrained by the overall drivetrain layout.
  • The 18,000 km change interval, paired with a 6,000 km check interval, reflects a three-to-one ratio between inspection and replacement cycles, a pattern that accounts for gradual fluid degradation while allowing early detection of level loss or contamination before the full service interval is reached.

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