Triumph 1800 Roadster/Saloon
Coolant capacity & service interval
The Triumph 1800 Roadster/Saloon requires coolant with a capacity of 10.8 liters. The data covers 2 configurations of this model.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| Roadster 1800 (1946-1949) |
|
| Saloon 1800 (1946-1949) |
|
Additional Notes
- Both the Roadster 1800 and Saloon 1800 share an identical coolant capacity of 10.8 liters, which is a relatively large figure for a passenger car of the mid-to-late 1940s and reflects the demands of the 1800cc four-cylinder engine used across both body styles.
- A 10.8-liter cooling system capacity falls into the range typically associated with a full system fill, meaning the figure accounts for the radiator, engine block water jackets, hoses, and heater circuit combined rather than a partial or top-up quantity.
- The capacity listed for both configurations applies under normal use conditions, which in coolant service terminology generally refers to standard operating environments without the added thermal stress of towing, sustained high-load driving, or extreme ambient temperatures.
- The Triumph 1800 Roadster and Saloon share the same 10.8-liter specification across the full 1946-1949 model range, indicating no variation in cooling system volume between model years within either body style.