Triumph 1800 Roadster/Saloon

Manual transmission fluid capacity & service interval

Triumph 1800 Roadster/Saloon manual transmission fluid capacity is 1,14 liters. Service intervals include checking at 3200 km and changing at 16000 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)
  • Use: Normal
  • Capacity 1,14 liter
  • Check 3200 km
  • Change 16000 km
  • Code: 4/1
Saloon 1800 (1946-1949)
  • Use: Normal
  • Capacity 1,14 liter
  • Check 3200 km
  • Change 16000 km
  • Code: 4/1

Additional Notes

  • Both the Roadster 1800 and Saloon 1800 share an identical manual transmission fluid capacity of 1.14 liters, which is a relatively modest fill volume consistent with the compact gearbox designs common to British light cars of the mid-to-late 1940s.
  • A 1.14-liter capacity figure typically represents a service fill level, meaning the quantity of fluid required when the transmission is drained and refilled during routine maintenance rather than a full overhaul involving complete disassembly.
  • The specified check interval of 3,200 km applies under normal use conditions for both the Roadster 1800 and Saloon 1800, reflecting a relatively frequent inspection schedule by modern standards and one that aligns with the mechanical tolerances and sealing materials available in postwar automotive engineering.
  • The change interval of 16,000 km under normal use conditions means fluid replacement was expected roughly every five check cycles, a ratio that points to a conservative maintenance philosophy suited to the era's gear oil formulations.
  • The Triumph 1800 Roadster and Saloon share not only the same capacity but also the same check and change intervals, indicating no differentiation in transmission service requirements between the two body styles despite their distinct structural configurations.

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