Mazda RX (EU)

Coolant capacity & service interval

Mazda RX (EU) coolant capacity ranges from 7 to 8 liters. Service intervals occur every 48000 km or 24 months. The data covers 2 configurations.

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

TypeSpecifications
RX-3 (1972-1978)
  • Use: Normal
  • Capacity 7 liter
  • Change 48000 km/ 24 months
RX-2 (1971-1974)
  • Use: Normal
  • Capacity 8 liter
  • Change 48000 km/ 24 months

Additional Notes

  • The Mazda RX-2 (1971-1974) cooling system holds 8 liters of coolant, while the RX-3 (1972-1978) holds 7 liters, a difference of 1 liter between the two models despite sharing the same service interval structure.
  • Both the RX-2 and RX-3 share a coolant change interval of 48,000 km or 24 months under normal use conditions, meaning whichever threshold is reached first would trigger a service.
  • The 8-liter capacity listed for the RX-2 cooling system reflects a full system fill, which typically accounts for the radiator, engine block passages, heater core, and connecting hoses taken together.
  • The RX-3 cooling system capacity of 7 liters is consistent with a slightly smaller or more compact cooling circuit, as rotary engines of this era varied in their auxiliary component layouts despite sharing a common engine family.
  • A 24-month time limit on the coolant change interval, as specified for both the RX-2 and RX-3, reflects the degradation rate of corrosion inhibitors in coolant formulations, which break down over time regardless of mileage accumulated.

Other Systems