BMW M135i N55 reliability

[Levi1501]

Hi,
I’ve been looking at BMW M135i’s recently and was wondering what common faults they have?

Is the N55 a reliable engine? What are N55 specific common faults? What are common faults with the F20 1 Series in general?

This can be applicable to ZF 8 Speed cars and 6 speed manual.

Cheers,
Levi