To guarantee reliability, choose BMW part # 17139885509 SCREW CAP FOR EXPANSION TANK. It is also referred to as Coolant Reservoir Cap, Radiator Cap. This genuine part is built directly by BMW under very rigorous testing and developed using reliable materials to tolerate years of heavy use and present long-lasting performance. This part fits 2022-2024 i4, 2023-2024 i7, 2022-2024 iX.
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