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This part is listed by BMW as BMW part number 17117639020 (17 11 7 639 020) and is described as Coolant Expansion Tank Cap (sometimes called the radiator cap, even though it's actually installed on the expansion tank). This cap is used on many models and chassis, such as the E90/E91/E92/E93 3 Series, E82/E88 1 Series, E84 X3, E70 X5 35d, E89 Z4, F22/F23 2 Series, F30/F31/F34 3 Series, F32/F33/F36 4 Series, F01/F02 7 Series, F10 5 Series, F12/F13 6 Series, F15 X5, F16 X6, F06 6 Series Gran Coupe, F25 X3, F26 X4, F80 M3, F82 M4, F87 M2, G01 X3, G02 X4, G05 X5, G12 7 Series (740i/Li), G30 5 Series, and more.
While your BMW cooling system may be considered very reliable, it's all depending on this coolant reservoir cap. This cap is not just to seal the coolant expansion tank - it regulates and maintains the pressure in the cooling system (2.0 bar). A failed cap can lower the pressure inside the system and lead to an overheating situation. Replacement of the cap is recommended every three years to ensure optimum cooling efficiency and performance. It's a simple and inexpensive preventative maintenance step.
This is a radiator cap manufactured by Rein (CRP) Automotive - the original supplier to BMW for this part, as well as many other cooling system parts. As the OEM it meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.
This cap is used on many BMWs. Please make sure the style of cap matches that of your BMW, and check our detailed list of fitments below carefully.
BMW Fitments:
1 Series E82 / E88 (08-13) > 128i E82 / E88 (08-13) > 135i E82 / E88 (08-13) > 135is E82 / E88 (08-13) > 1M (11-12) 2 Series F22 / F23 (2014+) > 228i F22 / F23 (2014+) > 228i xDrive F22 / F23 (2014+) > 230i F22 / F23 (2014+) > 230i xDrive F22 / F23 (2014+) > M235i F22 / F23 (2014+) > M235i xDrive F22 / F23 (2014+) > M235i-Racing F22 / F23 (2014+) > M240i F22 / F23 (2014+) > M240i xDrive F22 / F23 (2014+) > M240i-Racing 2 Series F87 (2016+) > M2 Competition S55 (2019+) F87 (2016+) > M2 N55 (2016-2018) 3 Series E90 / E91 / E92 / E93 (06-13) > 325i E90 / E91 / E92 / E93 (06-13) > 325xi E90 / E91 / E92 / E93 (06-13) > 328i E90 / E91 / E92 / E93 (06-13) > 328xi E90 / E91 / E92 / E93 (06-13) > 330i E90 / E91 / E92 / E93 (06-13) > 330xi E90 / E91 / E92 / E93 (06-13) > 335d E90 / E91 / E92 / E93 (06-13) > 335i E90 / E91 / E92 / E93 (06-13) > 335is E90 / E91 / E92 / E93 (06-13) > 335xi 3 Series F30 / F31 / F34 (2012-2019) > 320i F30 / F31 / F34 (2012-2019) > 320i xDrive F30 / F31 / F34 (2012-2019) > 328d F30 / F31 / F34 (2012-2019) > 328d xDrive F30 / F31 / F34 (2012-2019) > 328i F30 / F31 / F34 (2012-2019) > 328i xDrive F30 / F31 / F34 (2012-2019) > 330i F30 / F31 / F34 (2012-2019) > 330i xDrive F30 / F31 / F34 (2012-2019) > 335i F30 / F31 / F34 (2012-2019) > 335i xDrive F30 / F31 / F34 (2012-2019) > 340i F30 / F31 / F34 (2012-2019) > 340i xDrive F30 / F31 / F34 (2012-2019) > Hybrid 3 4 Series F32 / F33 / F36 (14-20) > 428i F32 / F33 / F36 (14-20) > 428i xDrive F32 / F33 / F36 (14-20) > 430i F32 / F33 / F36 (14-20) > 430i xDrive F32 / F33 / F36 (14-20) > 435i F32 / F33 / F36 (14-20) > 435i xDrive F32 / F33 / F36 (14-20) > 440i F32 / F33 / F36 (14-20) > 440i xDrive 5 Series F10 / F11 (11-16) > 528i N20 (2012-2016) F10 / F11 (11-16) > 528i N52 (2011) F10 / F11 (11-16) > 528i xDrive N20 (2012-2016) F10 / F11 (11-16) > 535d F10 / F11 (11-16) > 535d xDrive F10 / F11 (11-16) > 535i F10 / F11 (11-16) > 535i xDrive F10 / F11 (11-16) > Hybrid 5 5 Series G30 (2017-) > 530i G30 (2017-) > 530i xDrive G30 (2017-) > 540i (B58A 2017-2019) G30 (2017-) > 540i (B58C 2020-) G30 (2017-) > 540i xDrive (B58A 2017-2019) G30 (2017-) > 540i xDrive (B58C 2020-) 6 Series F12 / F13 (12-18) > 640i 7 Series F01 / F02 (2009-2015) > 740Li F01 / F02 (2009-2015) > 740i 7 Series G12 (2016+) > 740i G12 (2016+) > 740i xDrive X1 Series E84 X1 (2013-2015) > X1 28i E84 X1 (2013-2015) > X1 28i xDrive X3 Series F25 X3 (2011-2017) > X3 sDrive28i F25 X3 (2011-2017) > X3 xDrive28d Diesel F25 X3 (2011-2017) > X3 xDrive28i X3 Series G01 X3 (2018+) > X3 M40i G01 X3 (2018+) > X3 xDrive30i X4 Series F26 X4 (2015-2018) > X4 28i xDrive F26 X4 (2015-2018) > X4 35i xDrive F26 X4 (2015-2018) > X4 M40i xDrive X4 Series G02 X4 (2019+) > X4 M40i G02 X4 (2019+) > X4 xDrive30i X5 Series E70 X5 (07-13) > X5 xDrive35d X5 Series F15 X5 (2014-2018) > X5 sDrive35i F15 X5 (2014-2018) > X5 xDrive35d F15 X5 (2014-2018) > X5 xDrive35i X5 Series G05 X5 (2019+) > X5 xDrive40i X6 Series F16 X6 (2015-2019) > X6 sDrive35i F16 X6 (2015-2019) > X6 xDrive35i Z Series E89 Z4 (2009-2016) > Z4 sDrive28i E89 Z4 (2009-2016) > Z4 sDrive30i E89 Z4 (2009-2016) > Z4 sDrive35is
$17.99
Coolant Expansion Tank Cap, Rein - E82, F22, E9X, F3X, F10, F13, G30, F01, F02, F25, F26, G01, G02, E70, F15, G05, E71, F16, G06
Keep optimum cooling performance - replace your cap every three years! High quality replacement for BMW part #17117639020.
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