Anyone know what this pipe is? BMW 520d

[Benjijames28]

https://streamable.com/p47ej

On the above clip look at the pipe that is in the middle of the screen when I turn it sideways? The pipe is aiming down to the floor.

I want to know what it is because I've noticed it seems to be leaking oil a little. It's hard to see on the video. But anyone familiar with the n47 engine might have. A better idea than me.

Thanks for help.

[helix402]

Off the top of my head it's a breather pipe. They commonly fail on the N47 and 57. Look it up on realoem and find the part no. Then pop it into eBay, you'll find main dealers sell them there.