Hillman Imp
Coolant capacity & service interval
Hillman Imp coolant capacity ranges from 5.8 to 6.2 liters including heater. The data covers 5 different configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| Imp Californian (1967-1970) |
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| Imp Sport (1966-1976) |
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| Imp Mk II (1965-1973) |
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| Imp Super (1965-1976) |
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| Imp Mk I (1963-1965) |
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Additional Notes
- The Hillman Imp Mk I (1963-1965) is the only variant listed with a capacity range of 5.8-6.2 liters for the cooling system, whereas all other Imp variants carry a fixed 6.2-liter figure.
- The 6.2-liter cooling system capacity noted across the Imp Californian, Mk II, Sport, and Super represents the fill volume excluding the heater circuit, as each specification carries a separate "(+ heater)" qualifier indicating additional fluid volume beyond the stated figure.
- The variable 5.8-6.2-liter range on the Mk I cooling system suggests a tolerance in fill volume, which in practice can reflect differences in heater circuit configuration or air purging during refill procedures.
- The Imp Sport covers the widest production span among the listed variants at 1966-1976, yet shares the same 6.2-liter (+ heater) cooling system capacity as the Imp Californian and Imp Mk II.
- The Imp Super (1965-1976) and Imp Sport (1966-1976) share identical cooling system capacities of 6.2 liters (+ heater) despite representing distinct trim levels within the Imp lineup.
- The Imp Californian, produced from 1967-1970, carries the same 6.2-liter (+ heater) cooling capacity as the longer-running Imp Mk II (1965-1973), indicating no capacity change between those two variants across their overlapping production years.