Provent 200 Catch Can - How well does it work??

Catch cans are supposed to stop manifold build-up by removing oily blow-by fumes. But do they actually work?

UPDATE AUGUST 2022: Follow-up 20,000km later: https://youtu.be/7mfqRSkopXY

I installed a Provent 200 catch can in our 2012 Mitsubishi Pajero, then clocked up 18,000kms travelling through Western Australia, Northern Territory and South Australia, and here are the results!
0:00 - Introduction
0:20 - What causes manifold build-up?
1:25 - How a catch can tries to fix this problem
2:08 - The Provent 200 kit
2:44 - 2000km test
4:07 - 7000km test
6:32 - 18000km test
7:18 - Initial conclusion
7:57 - Future work required
8:49 - Recommendations

Видео Provent 200 Catch Can - How well does it work?? канала The Musing Greg