About This

• FITMENT FOR 3 SERIES:For BMW 320i 2001-2005 2.2L I6 Gas. For BMW 323Ci 2000 2.5L I6 Gas. For BMW 323i 1999-2000 2.5L I6 Gas. For BMW 325Ci 2001-2006 2.5L I6 Gas. For BMW 325i 2001-2005 2.5L I6 Gas. For BMW 325xi 2001-2005 2.5L I6 Gas. For BMW 328Ci 2000 2.8L I6 Gas. For BMW 328i 1999-2000 2.8L I6 Gas. For BMW 330Ci 2001-2006 3.0L I6 Gas. For BMW 330i 2001-2005 3.0L I6 Gas. For BMW multiline 330xi 2001-2005 3.0L I6 Gas. All listed engines are naturally aspirated.
• FITMENT FOR X3, X5:For BMW X3 2004-2010 2.5L I6 Gas, 3.0L I6 Gas. For BMW X5 2001-2006 3.0L I6 Gas. Verify the exact model, year, engine displacement, original reservoir shape and replacement number before ordering.
• PRESSURIZED 1.2 L CONFIGURATION:The included cap has a listed maximum pressure rating of 200 ±15 kPa. The 1.2 L capacity is measured at the MAX fill level rather than the brim, leaving the intended coolant expansion space. PA66+GF30 construction is rated from -30°C to 120°C and supports dimensional stability around the cap neck, hose connections, sensor area and mounting points through normal heat cycles and vibration. Configured for applications using an external coolant-level sensor; confirm the original sensor and connector before ordering.
• REPLACEMENT REFERENCES:Cross-references 17137787039, 17117573781, 17132247553, 17111436413, 17111468077, 17111712669, 17117573751, 603-535, 603535, FRT1901C, BM3014102, EPT0018, 376755111, EPK0018 and S49002. Compare both the reference number and physical connection layout because similar-looking reservoirs may use different hose or sensor configurations.
• BUILT AROUND REAL REPLACEMENT NEEDS:Cracks, seam or hose-neck seepage, dried coolant residue, repeated coolant top-offs or a low-coolant warning may indicate deterioration of the original reservoir or its connections. BDFHYK treats the tank as part of a pressurized cooling system: cap rating, cap-neck sealing, hose connections, clamps, sensor seating and correct filling and bleeding all affect operation. Continued coolant loss or elevated engine temperature requires complete cooling-system diagnosis.