Morris Isis

Manual transmission fluid capacity & service interval

Morris Isis manual transmission fluid capacity is 2,56 liters. Service intervals include checks at 1600 km and changes at 800 km or 10000 km. The data covers 4 configurations.

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

TypeSpecifications
Isis Saloon, Series II (1956-1958)
  • Use: Normal
  • Capacity 2,56 liter
  • Check 1600 km
  • Change 10000 km
  • Code: 4/1
Isis Saloon, Series II (1956-1958)
  • Use: Initial service
  • Capacity 2,56 liter
  • Change 800 km
  • Code: 4/1
Isis Traveller, Series II (1956-1958)
  • Use: Normal
  • Capacity 2,56 liter
  • Check 1600 km
  • Change 10000 km
  • Code: 4/1
Isis Traveller, Series II (1956-1958)
  • Use: Initial service
  • Capacity 2,56 liter
  • Change 800 km
  • Code: 4/1

Additional Notes

  • The Morris Isis Series II manual transmission holds 2.56 liters of fluid across both the Saloon and Traveller body styles, a capacity consistent with the compact gearbox designs common to British saloons of the mid-1950s.
  • Under normal use conditions, the Saloon and Traveller share identical service intervals: a fluid level check at 1,600 km and a full fluid change at 10,000 km.
  • An initial service change interval of 800 km applies to both the Saloon and Traveller, reflecting the break-in period practice of removing early wear particles and manufacturing residues from a new or freshly serviced gearbox before the standard change schedule begins.
  • The 2.56-liter capacity figure remains unchanged between the initial service and normal use rows for both body styles, indicating a full drain-and-refill procedure rather than a partial top-up at either interval.
  • The 1956-1958 date range applies uniformly to all four specification rows, with no variation in fluid capacity or service intervals recorded between the Saloon and Traveller configurations across those model years.

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