I also have the same prob on my car, but not a serious leak. And yes it should be the Distributor O-ring, anyway post here once you get it fixed
Maybe the tappet noise suggest you to get a valve lash (tappet) adjustment
No replacement for displacement?? I don't know. Research
Anyways I was wrong about the white EK SiR owner, a friend told it has changed hands just recently
What's the HZ number? An integra? Anyways, 2L DOHC Turbo? Maybe not a Honda.
Ya i was referring the 'Honda Sports Car', it's a 94 Prelude, but ya triptronic and too cheap