I'm subscribed to Engineering Explained and just found (link goes to YouTube). I learned more about positive crankcase ventilation systems too, so I looked in the Crossfire service manual for info on how it's implemented in the m112 engine. I understand now why I saw a little pool of oil beneath the protrusion into the throttle body (4 in image) when I installed my catch can.

positive crankcase ventilation (PCV) system, service manual p. 25-16

I wanted to share this video and that bit I learned from it because I realized I bought and installed the oil catch can without really knowing what it does. I bought it because I vaguely knew about a problem with oil in the intake manifold, and also because when I emailed NeedsWings about which parts to begin with from their site Rob responded with a list of things, and the catch can kit was at the top. I just put full faith into his judgement since NeedsWings was amazing with helping me refurbish the SKREEM earlier this year, and the fact they emailed me back with a thought-out list showed great customer service to me. Hopefully this post will help anyone wondering what catch cans do and where they should get one, I guess.

The video also talks about how oil deposits on the intake valves are greater/lesser depending upon which fuel injection system is used and how the particulates that flow through the PCV follow the path of least resistance, causing intake valves for some cylinders to form more deposits than others. Having no experience removing the valve covers of the m112 (or any engine yet), I was wondering if anyone noticed something similar with this engine when taking it apart. It'd be sweet to have a real-world anecdote for me to visualize this (at least until I finally feel confident enough to remove my own valve covers without screwing it up).

Thanks for reading, have a good one!