BMW N55 engine loud rattle/knocking from top of the engine.

BMW X5 35i, 335i, 535i

https://video.wixstatic.com/video/db2161_9687610b063646f09435bc6b62665993/1080p/mp4/file.mp4

Its a bad lifter sound, so there is a video of a bad lifter next to a good one

https://video.wixstatic.com/video/db2161_dac61edaefb54a848be5b85eea36d33b/1080p/mp4/file.mp4

and there is a sound after lifter replacement .

.

https://video.wixstatic.com/video/db2161_3f9073e38563456a91ff79877febfe61/1080p/mp4/file.mp4