MG MGB / MGC

Coolant capacity & service interval

The MG MGB / MGC coolant specifications cover capacities ranging from 5.6 liters to 10.5 liters depending on the configuration. The data includes six different configurations. The fluid type specified is coolant for normal use.

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

TypeSpecifications
MGB (1974-1980)
  • Use: Normal
  • Capacity 6,6-6,8 liter
MGB (USA/CAN) (1974-1980)
  • Use: Normal
  • Capacity 6,6-6,8 liter
MGB GT V8 (1973-1976)
  • Use: Normal
  • Capacity 9,1 liter
MGC (1967-1969)
  • Use: Normal
  • Capacity 10,2-10,5 liter
MGB GT (1965-1974)
  • Use: Normal
  • Capacity 5,6 liter
MGB (1962-1974)
  • Use: Normal
  • Capacity 5,6 liter

Additional Notes

  • The MG MGB in its early production years (1962-1974) carried a cooling system capacity of 5.6 liters, a figure shared exactly by the MGB GT (1965-1974), reflecting the common four-cylinder engine and shared bodyshell architecture between the roadster and fastback variants.
  • From 1974 onward, the MGB cooling system capacity rose to a range of 6.6-6.8 liters, a notable increase over the earlier 5.6-liter figure that points to changes in the engine bay configuration introduced during that period of production.
  • The MGB (USA/CAN) specification for 1974-1980 lists the same 6.6-6.8 liter capacity as the standard MGB of the same years, indicating that the North American market variants, which carried additional emissions and safety equipment, did not require a differently sized cooling circuit.
  • The MGB GT V8 (1973-1976) carries a cooling system capacity of 9.1 liters, substantially higher than the 5.6 liters specified for the four-cylinder MGB GT of the preceding years. The larger volume reflects the demands of the Rover V8 engine fitted to the GT V8 variant.
  • The MGC (1967-1969) holds the largest cooling system capacity in the range at 10.2-10.5 liters. The MGC used a 2912 cc straight-six engine in place of the MGB's four-cylinder unit, and the wider capacity range of 0.3 liters may reflect minor variation between individual vehicles or measurement methods.
  • All six configurations across the MGB and MGC range are listed under normal use conditions, meaning the stated capacities apply to standard operating environments rather than severe-duty or special-case service scenarios.

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