This part is listed by BMW as BMW part number 11288604266 (11 28 8 604 266) and is described as OEM Drive Belt & Tensioner Kit for BMW F22 M235i, F30 335i, F32 435i, F25 X3 35i, F26 X4 M40i with the N55 engine.
Kit contents:
11287628661, 8PK1390 main drive belt
11288604266, mechanical belt tensioner
11288673720, deflection pulley
The main drive belt runs the power steering pump, air conditioning compressor, and alternator on the N55 6-cylinder turbo engine. It's very important not to neglect your drive belts as a failure will leave you stranded. They're easy to inspect during normal maintenance such as an oil change or refilling your washer tank. If there are cracks running across the ribs, sections missing, the edges are frayed, or the threads are visible on the belt surface, the belt should be replaced immediately.
This is an OEM Drive Belt Kit manufactured by INA Schaeffler - the original supplier to BMW for this part, as well as many other engine components. 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.
For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
BMW Fitments:
2 Series
F22 / F23 (2014-2021) > M235i
F22 / F23 (2014-2021) > M235i xDrive
3 Series
F30 / F31 / F34 (2012-2019) > 335i
F30 / F31 / F34 (2012-2019) > 335i xDrive
4 Series
F32 / F33 / F36 (14-20) > 435i
F32 / F33 / F36 (14-20) > 435i xDrive
X3 Series
F25 X3 (2011-2017) > X3 xDrive35i
X4 Series
F26 X4 (2015-2018) > X4 M40i xDrive