BMW 4 series Gran Coupé, G26 (USA)

Additional Notes

• The BMW 4 Series Gran Coupé G26 cooling system is divided into two separate circuits: a high temperature cooling circuit and a low temperature cooling circuit. Each circuit carries a distinct fluid capacity and serves a different thermal management function within the engine bay.
• The high temperature cooling circuit handles the primary engine cooling load, while the low temperature cooling circuit manages heat from components such as charge air coolers and, in mild-hybrid variants, power electronics that operate at lower thermal thresholds.
• On the 430i Gran Coupé and 430i xDrive Gran Coupé across 2021-2024, the high temperature circuit holds 9.8 liters and the low temperature circuit holds 4.2 liters, giving a combined system capacity of 14.0 liters.
• The M440i Mild-Hybrid Gran Coupé and M440i Mild-Hybrid xDrive Gran Coupé carry a larger high temperature circuit capacity of 10.5 liters alongside a low temperature circuit of 4.5 liters, for a combined total of 15.0 liters. The increase over the 430i figures reflects the additional thermal demands of the inline-six engine and the integrated mild-hybrid components.
• All listed configurations specify coolant capacity under normal use conditions, meaning the figures apply to standard operating environments rather than severe-duty or extreme-climate service scenarios.
• The 430i Gran Coupé and M440i Mild-Hybrid Gran Coupé each appear under two separate year-range entries, with the 2021-2024 and 2024 starting-year entries sharing identical capacity values across both circuits for their respective engine variants.