Of course some knowledgeable members will come a long and give you more specific helpful advice, but I would be remiss if I didn't first suggest an easy solution that's worked for me.
I don't know of anywhere in the Owner's Manual Honda specifies when or even if you should change the PCV valve. But you should anyway. Think of it as cheap insurance against a much more costly leak repair, or the difference between a seal that's going bad but not so far gone that it can't be saved by some Stop ATP AT-205 and a PCV valve swap. Just tread lightly when you remove the old one: Small oil leak, rear main seal?
Easiest thing to do is to clean all those parts of the oil and gunk, wait a week, and then check to see where it is starting from. When I had to do this I went to a self car wash with a jack, jacked up the front end, and just blasted everything off. When I got home I wiped everything down and used BPC on anything that stuck around.
Once you check that, there are a couple common places that leak (someone please correct me my advice for an '05 is different than an '08):
The filter itself
Start at the top and work your way down.
Also - if you haven't verified the "oil" isn't "grease" from a broken CV boot you should check that.
Thanks Chris. I will do that. Also thought I should check Variable valve timing solenoid gasket if that is different from filter housing/adapter. Do you think PCV would contribute? I don’t think it has ever been changed.
If the PCV is stuck in the wrong position pressure within the crankcase will build up. The pressure will relieve itself through the path of least resistance. I would definitely give that valve a check. Just be careful when you remove it as folks have ended breaking them off (there are threads on this forum of what to do should that happen).
Decided to change the PCV valve on my '05 Pilot. Loosened the one bolt holding it in and it would not come out. I tried to wiggle it and turn to get it out with no luck. I slipped a small flat screwdriver blade behind the housing and the end cracked off leaving the rest inside the engine...