1997 Subaru Legacy GT 2.5. I'm seeing oil residue at the bottom of my motor, trace it back to the hose that goes up to the IAC valve. Any idea why there would be oil here? Did I overfill it when I changed the oil? Thanks!

Not overfilled with oil, I checked the dipstick after sitting on flat ground overnight. Head gasket was done about 50k miles ago, so I don't think its that. Any ideas?

PCV valve is clogged and oil vapor is pushing up through the breather hoses into the air intake tube.

 

That would be my guess.

Thanks! That sounds like about as easy of fix as there can be