Austin-Healey 100

Coolant capacity & service interval

The Austin-Healey 100 uses coolant with a capacity ranging from 10.8 to 11.4 liters. The data covers 4 configurations of this model.

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

TypeSpecifications
100/6, BN4 / BN6 (1957-1959)
  • Use: Normal
  • Capacity 10,8 liter
100/6, BN4 (1956-1957)
  • Use: Normal
  • Capacity 10,8 liter
100/4, BN2 (1955-1956)
  • Use: Normal
  • Capacity 11,4 liter
100/4, BN1 (1953-1955)
  • Use: Normal
  • Capacity 11,4 liter

Additional Notes

  • The Austin-Healey 100 cooling system capacities fall into two distinct groups across the 1953-1959 production span, with the four-cylinder variants holding 11.4 liters and the six-cylinder variants holding 10.8 liters.
  • The BN1 and BN2 variants, covering 1953-1956, share an identical cooling system capacity of 11.4 liters, indicating no change to the cooling circuit between those two four-cylinder body series.
  • A capacity reduction of 0.6 liters appears when moving from the four-cylinder BN1/BN2 series to the six-cylinder BN4 introduced in 1956, where the cooling system holds 10.8 liters despite the engine gaining two cylinders.
  • The 100/6 BN4 produced in 1956-1957 and the later BN4/BN6 produced in 1957-1959 carry the same 10.8-liter cooling system capacity, meaning the transition to the BN6 body brought no change to the coolant volume specification.
  • All four configurations across 1953-1959 are rated under normal use conditions, with no separate severe-use interval or capacity figure listed for any variant.
  • An 11.4-liter cooling system capacity, as seen on the BN1 and BN2, represents a relatively substantial fill volume for a mid-1950s sports car, reflecting the demands placed on coolant circulation in a high-output four-cylinder engine of that era.

Other Systems