MG Midget

Coolant capacity & service interval

MG Midget coolant capacity ranges from 3,4 to 6 liters. Service intervals require checks every 10000 km or 6 months. The data covers 6 configurations.

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

TypeSpecifications
Midget MK III 1500 (1977-1979)
  • Use: Normal
  • Capacity 4,25 liter (+ heater)
  • Check 10000 km/ 6 months
Midget MK III 1500 (1974-1977)
  • Use: Normal
  • Capacity 4,25 liter (+ heater)
  • Check 10000 km/ 6 months
Midget MK III (1970-1974)
  • Use: Normal
  • Capacity 3,4 liter (+ heater)
Midget MK III (1966-1969)
  • Use: Normal
  • Capacity 6 liter
Midget MK II 1100 (1963-1966)
  • Use: Normal
  • Capacity 5,7 liter
Midget MK I (1962-1963)
  • Use: Normal
  • Capacity 5,7 liter

Additional Notes

  • The MG Midget MK I and MK II 1100, covering 1962-1966, share an identical cooling system capacity of 5.7 liters, despite the MK II introducing the 1100cc engine variant.
  • The MK III with the 1966-1969 engine configuration carries a slightly larger cooling system capacity of 6 liters, representing the highest total coolant volume across all Midget variants in these specifications.
  • The MK III produced in 1970-1974 shows a notably reduced stated capacity of 3.4 liters, qualified by the addition of heater circuit volume, meaning the figure excludes the heater core and associated plumbing from the base measurement.
  • The parenthetical "(+ heater)" notation appearing on the 1970-1974 MK III and both MK III 1500 entries indicates the heater circuit holds additional coolant volume beyond the listed figure, so total system fill during a full drain and refill would exceed the stated capacity.
  • The transition from the 1970-1974 MK III to the MK III 1500 introduced in 1974 brought a capacity increase from 3.4 liters to 4.25 liters (both excluding heater volume), reflecting the change to the 1500cc Triumph-sourced engine.
  • The MK III 1500 variants spanning 1974-1979 are the only configurations in these specifications to carry a defined service check interval, set at every 10,000 km or 6 months, whichever comes first.
  • The 1974-1977 and 1977-1979 MK III 1500 entries are identical in both capacity and service interval, with both specifying 4.25 liters (plus heater) and a 10,000 km or 6-month check schedule.

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