While browsing through some YouTube videos, I came across one that showed the process of replacing the vanos oil filter in a E49, which looked like a small screen on the end of a sensor of some type. The presenter mentioned this was a 'must do' as the screen blocks up, even when regular oil changes are undertaken. As a newby BMW owner, I was wondering how often other owners do this and what's involved in the N62 engine (are there two)?