Toyota bZ4X (USA / CAN)

Additional Notes

• The Toyota bZ4X carries two separate coolant circuits: one serving the inverter and one serving the heater. Each circuit holds a distinct fluid volume and is serviced independently.
• The inverter cooling system on the 150 kW configuration holds 5.9 liters, while the same circuit on the 160 kW configuration holds 7.4 liters. The larger capacity on the higher-output motor reflects the greater thermal load placed on the inverter cooling circuit.
• The heater cooling system capacity is 4 liters across all configurations, covering both the 150 kW and 160 kW variants in FWD and AWD form.
• Under normal use conditions, both the inverter and heater cooling circuits share the same check interval of every 15,000 miles or 18 months, whichever comes first.
• Under normal use conditions, the change interval for both circuits is 50,000 miles or 60 months. A 60-month span equals five years, placing coolant changes on a relatively long cycle compared to many conventional internal combustion engine service schedules.
• A first change only condition is listed separately for both circuits across all configurations. Under that condition, the initial coolant change is extended to 100,000 miles or 120 months, which is double the normal change interval.
• The 120-month first-change interval under the first change only condition represents a 10-year service window before the initial fluid replacement, after which the 50,000-mile or 60-month normal interval applies for subsequent changes.
• The check interval of 15,000 miles or 18 months remains identical under both the normal and first change only conditions, meaning the extended drain interval does not alter how frequently the fluid level and condition are inspected.
• AWD variants carry the same inverter and heater cooling system capacities as their FWD counterparts at each power level, with 5.9 liters in the inverter circuit for the 150 kW AWD and 7.4 liters for the 160 kW AWD.