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I wouldn't sweat it. A malfunctioning PCV system will result in a foamy, milky nasty mess that you would see under the cam/valve covers & on the dipstick. If the PCV system cannot evacuate crank case vapors (water vapor,fuel vapor,oil vapor,exhaust gas), you'll get the mess. Cheap parts store replacement PCV valves sometimes dont fit well in the vlv cover or on it's vac line, or can cause oil carry over into the intake (improper sized internal flow orifice). Gunk around the PCV valve is normal. Over time you get some seepage around the grommet. No big deal. I always try to stick with an OEM PCV valve. I normally dont replace them all that often, instead I remove & clean them with intake cleaner. You should be able to suck air thru the PCV valve & not blow air thru it. They are basically just a check valve.
G/luck
Joel
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2016 Subaru Forester 2.5i base CVT
2016 Nissan Quest SV
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