To guarantee reliability, choose BMW part # 17137639023 Radiator Expansion Tank Cap Cover. 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 1984-1987 325e, 1987-1992 325i, 1987-1990 325is, 1989-1991 525i.
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