Austin A55
Differential fluid capacity & service interval
Austin A55 differential fluid capacity ranges from 1,14 to 1,28 liters. Service intervals include a check at 1500 km and a change at 9000 km. The data covers 3 configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
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Additional Notes
- The Austin A55 Cambridge Mk I (1957-1958) rear differential holds 1.14 liters, while both the Mk II (1959-1961) and the Countryman (1960-1961) share a slightly larger 1.28-liter capacity, reflecting a modest increase between the two generations.
- A 1.14-liter differential fill on the Mk I is a relatively small sump volume, typical of compact rear axle housings found in mid-size British saloons of the late 1950s.
- The 1.28-liter capacity on the Mk II and Countryman variants represents a service fill figure, meaning the amount of fluid required when refilling a drained but otherwise intact differential assembly rather than a full overhaul rebuild.
- All three configurations share an identical check interval of 1,500 km, indicating that fluid level verification was expected at relatively short mileage intervals under normal use conditions.
- The change interval of 9,000 km applies uniformly across the Mk I, Mk II, and Countryman under normal use conditions, placing fluid renewal on a moderately frequent schedule by mid-century standards.
- The Countryman (1960-1961) wagon body style carries the same 1.28-liter rear differential capacity and 9,000 km change interval as the Cambridge Mk II saloon, suggesting both shared the same rear axle specification despite differing body configurations.