Package Packing: Including 2 pcs expansion tank caps 17117639020, 17117521071 for BMW that prevent frequent top-ups and overheating risks, reduce maintenance costs
Replacement Part Numbers: These caps directly replace 17117639020, 17117521071, 17-11-7-639-020, 17-11-7-521-071, so please verify compatibility before ordering
Fitment: The 17117521071 expansion tank cap for BMW is compatible with 2008-2013 128i (E82), 2008-2013 135i (E82), 2006 325i (E90), 2006 325xi/330xi (E90/E91), 2007-2013 328i (E90/E91/E92/E93), 2007-2008 328xi/335xi (E90/E92), 2011-2013 335is (E92/E93), 2009-2016 Z4 (E89), 2012-2015 X1 (E84), 2014-2016 428i/435i (F32/F33), 2013-2017 320i (F30), etc
Premium Build: Expansion tank cap 17117521071 with reinforced housing, high-grade seal, heat and corrosion resistance, leak-proof, pressure-stable
Safety Note: When replacing 17117639020 coolant cap for BMW F15, ensure engine is cooled, as hot removal may cause pressurized spray, risking burns or damage