Austin A40

Manual transmission fluid capacity & service interval

Austin A40 manual transmission fluid capacity ranges from 2 to 2,4 liters. Service intervals include checks at 1500 km and 3200 km or 1 month, and changes at 800 km, 8000 km, and 9000 km. The data covers 11 configurations.

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

TypeSpecifications
A40 Cambridge, GS5 (1954-1956)
  • Use: Normal
  • Capacity 2,4 liter
  • Check 1500 km
  • Change 9000 km
  • Code: 4/1
A40 Somerset (1952-1954)
  • Use: Normal
  • Capacity 2 liter
  • Check 3200 km/ 1 months
  • Change 8000 km
  • Code: 4/1
A40 Somerset (1952-1954)
  • Use: Initial service
  • Capacity 2 liter
  • Change 800 km
  • Code: 4/1
A40 Countryman (1947-1956)
  • Use: Normal
  • Capacity 2 liter
  • Check 3200 km/ 1 months
  • Change 8000 km
  • Code: 4/1
A40 Countryman (1947-1956)
  • Use: Initial service
  • Capacity 2 liter
  • Change 800 km
  • Code: 4/1
A40 Devon (1947-1952)
  • Use: Normal
  • Capacity 2 liter
  • Check 3200 km/ 1 months
  • Change 8000 km
  • Code: 4/1
A40 Devon (1947-1952)
  • Use: Initial service
  • Capacity 2 liter
  • Change 800 km
  • Code: 4/1
A40 Dorset (1947-1950)
  • Use: Normal
  • Capacity 2 liter
  • Check 3200 km/ 1 months
  • Change 8000 km
  • Code: 4/1
A40 Dorset (1947-1950)
  • Use: Initial service
  • Capacity 2 liter
  • Change 800 km
  • Code: 4/1
A40 Sports (1947-1953)
  • Use: Normal
  • Capacity 2 liter
  • Check 3200 km/ 1 months
  • Change 8000 km
  • Code: 4/1
A40 Sports (1947-1953)
  • Use: Initial service
  • Capacity 2 liter
  • Change 800 km
  • Code: 4/1

Additional Notes

  • The Austin A40 Cambridge GS5 (1954-1956) carries a manual transmission fluid capacity of 2.4 liters, which is notably higher than the 2-liter figure shared by all other A40 variants in the lineup. A larger stated capacity can reflect a physically different gearbox unit with greater internal volume.
  • The A40 Cambridge GS5 also differs in its service intervals, with a fluid check interval of 1,500 km and a change interval of 9,000 km under normal use conditions, compared to the 3,200 km check and 8,000 km change intervals specified for the Countryman, Devon, Dorset, Somerset, and Sports.
  • The A40 Countryman, Devon, Dorset, Somerset, and Sports all share an identical normal-use schedule: a fluid level check every 3,200 km or 1 month, whichever comes first, and a full fluid change every 8,000 km. The inclusion of a one-month time limit alongside the distance interval reflects that low-mileage use can still allow fluid degradation over time.
  • An initial service change at 800 km is specified for the A40 Countryman, Devon, Dorset, Somerset, and Sports. An early drain at this mileage is associated with removing metal particles and manufacturing residues that accumulate in a new or freshly serviced gearbox during its break-in period.
  • The A40 Cambridge GS5 has no initial service interval listed in the specifications, whereas the five other variants all carry the 800 km first-change requirement. This distinction separates the Cambridge GS5 from the earlier and concurrent body styles in terms of documented break-in servicing.
  • The A40 Dorset (1947-1950) and A40 Devon (1947-1952) share the same 2-liter capacity and identical normal and initial service intervals, despite covering slightly different production year spans. Both variants were early postwar models built on closely related platforms.
  • The A40 Somerset (1952-1954) and A40 Sports (1947-1953) also carry the same 2-liter capacity and matching service schedules as the Dorset and Devon, indicating a consistent gearbox specification across the majority of the A40 range throughout the full 1947-1956 period covered.

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