I’m pretty sure the cam seal on the Civic is leaking. Thankfully, it’s a fairly small plastic piece with an o-ring that snaps in to the side, without having to take the entire intake apart. I just got the parts today, and I’m planning on doing it in the next few days.  After watching a few videos, some guys seem to rely on just the o-ring to seal, while others also put a small amount of RTV along with the o-ring. Reading through the comments on the YouTube videos, some guys are “hey, never use RTV with an o-ring - let the o-ring do it’s job!” while people seem to have no issue with it.  Is it overkill to use both?