Replaces Part/OEM Number: 17117639020 Radiator Expansion Tank Cap, 17117521071 Radiator Expansion Tank Cap. Compatible With BMW Compact & 3 and 4 Series: Fit For 2011 M｜2008-2013 128i｜2008-2013 135i｜2006 323i｜2006 325i｜2005-2006 325xi｜2007-2016 328i｜2014-2016 328i GT xDrive｜2014-2016 328i xDrive｜2007-2008 328xi｜2013-2016 320i｜2013-2017 320i xDrive｜2014-2017 328d｜2014-2017 328d xDrive｜2016-2017 340i｜2016-2017 340i xDrive｜2014-2016 428i｜2015-2016 428i Gran Coupe｜2014-2016 428i xDrive｜2015-2016 428i xDrive Gran Coupe｜2014-2016 435i｜2014-2016 435i Gran Coupe｜2014-2016 435i xDrive｜2015-2016 435i xDrive Gran Cou Compatible With BMW Luxury And SUV Series: Fit For 2012-2016 528i｜2012-2016 528i xDrive｜2014-2016 535d｜2014-2016 535d xDrive｜2011-2016 535i｜2013-2016 535i GT｜2013-2016 535i GT xDrive｜2013-2016 535i xDrive｜2012-2017 640i｜2013-2017 640i Gran Coupe｜2014-2017 640i xDrive｜2014-2017 640i xDrive Gran Coupe｜2015 740Ld xDrive｜2011-2015 740Li｜2013-2015 740Li xDrive｜2011-2016 740i｜2008-2015 X1｜2011-2017 X3｜2015-2017 X4｜2009-2017 X5｜2015-2017 X6｜2009-2016 Z4｜2014-2017 i8 Radiator Expansion Tank Cap. Vehicle Compatibility: please ensure that you check the compatibility of our Radiator Expansion Tank Cap with your vehicle's year/make/model before purchasing (also see our model reference chart). If you have any doubts or questions, please don't hesitate to contact us for assistance. What You Get: a premium product, a welcome guide, our worry-free 12-month warranty, and friendly customer service. Replaces Part/OEM Number: 17117639020 ,17117521071 Radiator Expansion Tank Cap. Upgrade your vehicle's cooling system with this durable cap for reliable performance. 1. Radiator Expansion Tank Cap for BMW 1 Series M, 128i, and 135i: Upgrade your BMW 1 Series M or 128i/135i with our precision-engineered Radiator Expansion Tank Cap. 2011 1 Series M 2008-2013 128i 2008-2013 135i 2. Radiator Expansion Tank Cap for BMW 3 and 4 Series: Compatible with a range of models, including the 3 and 4 Series (e.g., 328i, 335i, 428i). 2006 323i 2006 325i 2005-2006 325xi 2007-2016 328i 2014-2016 328i GT xDrive 2014-2016 328i xDrive 2007-2008 328xi 2013-2016 320i 2013-2017 320i xDrive 2014-2017 328d 2014-2017 328d xDrive 2016-2017 340i 2016-2017 340i xDrive 2014-2016 428i 2015-2016 428i Gran Coupe 2014-2016 428i xDrive 2015-2016 428i xDrive Gran Coupe 2014-2016 435i 2014-2016 435i Gran Coupe 2014-2016 435i xDrive 2015-2016 435i xDrive Gran Coupe 3. Radiator Expansion Tank Cap for BMW Luxury and SUV Series: Tailored for various BMW Luxury and SUV models, such as the 528i, 535i, X5, and X6, our Radiator Expansion Tank Cap ensures a seamless fit. 2012-2016 528i 2012-2016 528i xDrive 2014-2016 535d 2014-2016 535d xDrive 2011-2016 535i 2013-2016 535i GT 2013-2016 535i GT xDrive 2013-2016 535i xDrive 2012-2017 640i 2013-2017 640i Gran Coupe 2014-2017 640i xDrive 2014-2017 640i xDrive Gran Coupe 2015 740Ld xDrive 2011-2015 740Li 2013-2015 740Li xDrive 2011-2016 740i 2008-2015 X1 2011-2017 X3 2015-2017 X4 2009-2017 X5 2015-2017 X6 2009-2016 Z4 2014-2017 i8