1. The expansion tank is a perfect replacement for 535i F11 20112016 and so on to better meet your demands. 2. Your vehicle engine coolant recovery tank or expansion tank will store excess pressure and coolant as your radiator heats up. 3. The reservoir helps keep your radiator full at all times and makes the radiator more efficient and effective. 4. If your coolant is low, it may indicate a , using a pressure tester (not included) to check the system for smaller leaks. 5. If your recovery tank is damaged, replace immediately to avoid a catastrophic cooling system failure. Name:Expansion tank Part number:17137647283, 17137601949, 17137553919, 17117639020, Applicable models:for for 535d F10 l6 3.0L Front Sedan 2014-2016 for 535i F11 l6 3.0L Petrol Front Hatchback 2011-2016 for 535i F10 l6 3.0L Petrol Front Sedan 2011-2016 for 535i GT F07 l6 3.0L Petrol Front Hatchback 2010-2017 for 640i F12 l6 3.0L Petrol Front Convertible 2012-2018 for 640i F13 l6 3.0L Petrol Front Coupe 2012-2018 for 640i Gran Coupe F06 l6 3.0L Petrol Front Sedan 2013-2019 for 740i F01 l6 3.0L Petrol Front Sedan 2010-2015 for 740Li F02 l6 3.0L Petrol Front Sedan 2011-2015 for ActiveHybrid 5 F04 l6 3.0L Petrol Front Sedan 2012-2016 for ActiveHybrid 7 F04 l6 3.0L Petrol Front Sedan 2013-2015 Colour:Black Material:Plastic Package Contents: 1x Expansion tank Only the above package content, other products are not included. Note: Light reflection 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.