[REPLACEMENT OVER BLOW CAP] The radiator cap holds the coolant inside the radiator, but it also works as a two-way valve that keeps the right pressure inside so the radiator does it work correctly. Symptoms of a Bad Radiator Cap: enters the system, low coolant level, coolant leaks, overflowing reservoir, overheating engine.[REPLACES PART] Coolant cap 17137516004 17117639021[FRIENDLY NOTE] It is extremely important to always make to allow the engine to cool down before removing the radiator cap, as removing the cap from a can cause sudden coolant spray and severe .Condition: NewManufacturer Part Number: 17137516004COMPATABILITY:2 Series F87 M2 LCI (10/2016 - 12/2019)3 Series E90 (01/2007 - 07/2008)3 Series E90 LCI (03/2008 - 10/2011)3 Series E92 (07/2006 - 02/2010)3 Series E92 LCI (09/2009 - 06/2013)3 Series E93 (03/2007 - 02/2010)3 Series E93 LCI (07/2009 - 10/2013)3 Series F80 M3 (04/ - 06/2015)3 Series F80 M3 LCI (01/2015 - 10/2018)4 Series F82 (02/2013 - 02/2017)4 Series F82 LCI (05/2016 - 12/2019)4 Series F83 (06/2013 - 02/2017)4 Series F83 LCI (05/2016 - 12/2019)5 Series E60 (12/2001 - 12/2009)5 Series E60 LCI (11/2005 - 12/2009)5 Series E61 (10/2002 - 02/2007)5 Series E61 LCI (11/2005 - 05/2010)5 Series F07 GT (09/2008 - 06/2013)5 Series F10 (01/2009 - 06/2013)5 Series F10 LCI (10/ - 10/2016)5 Series F11 (02/2009 - 06/2013)5 Series G30 (10/2015 - 12/2019)5 Series F90 M5 (01/2016 - 12/2019)6 Series E63 (05/2002 - 07/2010)6 Series E63 LCI (04/2006 - 07/2010)6 Series E64 (09/2002 - 07/2010)6 Series E64 LCI (04/2006 - 07/2010)Colour: blackMaterial: plasticPackage Contents:1 * Radiator CapOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.