BMW X3, G45 (USA)

Coolant capacity & service interval

The BMW X3, G45 (USA) uses coolant with a capacity ranging from 5.3 to 5.8 liters for the low temperature circuit and from 12.5 to 13.6 liters for the high temperature circuit. The data covers 2 configurations.

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

TypeSpecifications
X3 30 Mild-Hybrid xDrive (2024- )
  • Use: Normal
  • Capacity 12,5 liter (High temperature circuit)
  • Capacity 5,3 liter (Low temperature circuit)
X3 M50 Mild-Hybrid xDrive (2024- )
  • Use: Normal
  • Capacity 13,6 liter (High temperature circuit)
  • Capacity 5,8 liter (Low temperature circuit)

Additional Notes

  • The BMW X3 G45 cooling system is split into two separate circuits: a high temperature circuit and a low temperature circuit, each carrying its own distinct fluid capacity.
  • The high temperature circuit on the X3 30 Mild-Hybrid xDrive holds 12.5 liters, while the low temperature circuit holds 5.3 liters, bringing the combined total across both circuits to 17.8 liters.
  • The X3 M50 Mild-Hybrid xDrive carries a larger high temperature circuit capacity of 13.6 liters and a low temperature circuit capacity of 5.8 liters, for a combined total of 19.4 liters across both circuits.
  • The difference of 1.1 liters in the high temperature circuit and 0.5 liters in the low temperature circuit between the 30 and M50 variants reflects the greater thermal load generated by the M50's more powerful powertrain.
  • Both configurations are rated under normal use conditions, meaning the capacities listed apply to standard operating environments rather than severe-duty or performance-specific service scenarios.
  • The presence of a dedicated low temperature circuit in both variants is consistent with mild-hybrid architecture, where power electronics and ancillary components require cooling at lower thermal thresholds than the combustion engine itself.

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