Triumph 1800 Roadster/Saloon

Differential fluid capacity & service interval

Triumph 1800 Roadster/Saloon differential fluid capacity is 1,56 liters. The service interval is 8000 km. The data covers 2 configurations.

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

TypeSpecifications
  • Roadster 1800 (1946-1949)
  • Rear
  • Use: Normal
  • Capacity 1,56 liter
  • Change 8000 km
  • Saloon 1800 (1946-1949)
  • Rear
  • Use: Normal
  • Capacity 1,56 liter
  • Change 8000 km

Additional Notes

  • The Triumph 1800 Roadster and 1800 Saloon share an identical rear differential fluid capacity of 1.56 liters, which is a relatively modest fill volume consistent with the compact rear axle assemblies typical of light British motorcars from the mid-to-late 1940s.
  • A 1.56-liter capacity figure represents a service fill measurement, meaning the quantity of fluid required to bring a properly drained unit back to its correct operating level rather than the larger volume associated with a full overhaul or housing replacement.
  • Both the Roadster and Saloon variants across the 1946-1949 production span carry a fluid change interval of 8,000 km under normal use conditions, placing routine differential maintenance on a relatively frequent schedule by modern standards.
  • The normal use condition tied to the 8,000 km interval applies to both body configurations without distinction, indicating no differentiated service schedule between the open Roadster and the enclosed Saloon despite their differing body structures.

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