Toyota Mirai, JPD20 (USA / CAN)

Coolant capacity & service interval

Toyota Mirai JPD20 coolant capacity ranges from 4 to 16,4 liters. Service intervals include checks at 15000 miles or 18 months, and changes at 50000 miles or 60 months and 100000 miles or 120 months. The data covers 3 configurations.

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

TypeSpecifications
  • Mirai (2020- )
  • Fuel cell stack
  • Use: Normal
  • Capacity 16,4 liter
  • Check 15000 miles/ 18 months
  • Mirai (2020- )
  • Inverter
  • Use: Normal
  • Capacity 4 liter
  • Check 15000 miles/ 18 months
  • Change 50000 miles/ 60 months
  • Mirai (2020- )
  • Inverter
  • Use: First change only
  • Capacity 4 liter
  • Check 15000 miles/ 18 months
  • Change 100000 miles/ 120 months

Additional Notes

  • The Toyota Mirai JPD20 has two separate coolant circuits: one serving the fuel cell stack and another serving the inverter. Each carries its own capacity and service schedule.
  • The fuel cell stack cooling system holds 16.4 liters, a notably large capacity that reflects the thermal demands of hydrogen fuel cell operation, where the stack generates significant heat during the electrochemical reaction that produces electricity.
  • The inverter cooling system holds 4 liters, a considerably smaller volume than the fuel cell stack circuit, consistent with the more contained heat output of power electronics compared to the fuel cell stack itself.
  • Both cooling circuits share a check interval of every 15,000 miles or 18 months under normal use conditions, meaning neither circuit is treated as maintenance-free between service visits.
  • The inverter coolant change interval under normal use conditions is 50,000 miles or 60 months, which is a standard long-life coolant replacement cycle for modern automotive systems.
  • A separate first-change-only interval of 100,000 miles or 120 months applies to the inverter cooling system, doubling the standard change interval. A first-change-only designation typically means the factory-fill fluid is formulated to last longer before the initial drain, after which subsequent changes revert to the shorter normal-use interval.