Austin A40

Differential fluid capacity & service interval

Austin A40 differential fluid capacity ranges from 1,14 to 1,28 liters. Service intervals include 800 km, 1500 km, 3200 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)
  • Rear
  • Use: Normal
  • Capacity 1,14 liter
  • Check 1500 km
  • Change 9000 km
  • A40 Somerset (1952-1954)
  • Rear
  • Use: Normal
  • Capacity 1,28 liter
  • Check 3200 km/ 1 months
  • Change 8000 km
  • A40 Somerset (1952-1954)
  • Rear
  • Use: Initial service
  • Capacity 1,28 liter
  • Change 800 km
  • A40 Countryman (1947-1956)
  • Rear
  • Use: Normal
  • Capacity 1,28 liter
  • Check 3200 km/ 1 months
  • Change 8000 km
  • A40 Countryman (1947-1956)
  • Rear
  • Use: Initial service
  • Capacity 1,28 liter
  • Change 800 km
  • A40 Devon (1947-1952)
  • Rear
  • Use: Normal
  • Capacity 1,28 liter
  • Check 3200 km/ 1 months
  • Change 8000 km
  • A40 Devon (1947-1952)
  • Rear
  • Use: Initial service
  • Capacity 1,28 liter
  • Change 800 km
  • A40 Dorset (1947-1950)
  • Rear
  • Use: Normal
  • Capacity 1,28 liter
  • Check 3200 km/ 1 months
  • Change 8000 km
  • A40 Dorset (1947-1950)
  • Rear
  • Use: Initial service
  • Capacity 1,28 liter
  • Change 800 km
  • A40 Sports (1947-1953)
  • Rear
  • Use: Normal
  • Capacity 1,28 liter
  • Check 3200 km/ 1 months
  • Change 8000 km
  • A40 Sports (1947-1953)
  • Rear
  • Use: Initial service
  • Capacity 1,28 liter
  • Change 800 km

Additional Notes

  • The Austin A40 Cambridge GS5 rear differential holds 1.14 liters, a notably smaller capacity than the 1.28 liters specified for all other A40 variants in this range. The Cambridge GS5 also carries a check interval of 1,500 km, compared to the 3,200 km interval assigned to the remaining models.
  • The A40 Cambridge GS5 (1954-1956) has a fluid change interval of 9,000 km under normal use conditions, which is longer than the 8,000 km change interval shared by the Countryman, Devon, Dorset, Somerset, and Sports variants.
  • The 1.28-liter rear differential capacity is consistent across the A40 Countryman, Devon, Dorset, Somerset, and Sports across their respective model year spans from 1947 through 1956. This figure represents a service fill level, meaning the quantity of fluid required to bring the differential to its correct operating level during routine maintenance.
  • The A40 Countryman, Devon, Dorset, Somerset, and Sports all share a normal-use check interval of 3,200 km or one month, whichever comes first. The time-based component of 1 month reflects that differential fluid condition can degrade independently of distance traveled, particularly in low-mileage use patterns.
  • An initial service fluid change at 800 km is specified for the A40 Countryman, Devon, Dorset, Somerset, and Sports. An early change at this interval is associated with break-in periods, during which metal particles from newly machined gear surfaces can contaminate fresh differential fluid.
  • The initial service change interval of 800 km applies only to the Countryman, Devon, Dorset, Somerset, and Sports. No initial service entry appears for the A40 Cambridge GS5, which carries only a single normal-use specification.
  • The A40 Dorset covers the earliest and shortest production span in these specifications, running from 1947 to 1950, yet shares identical rear differential capacity and service intervals with the Devon (1947-1952), Somerset (1952-1954), and Sports (1947-1953) under both normal and initial service conditions.

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