gunk in oil filler cap - charade 2003 1.0 el

Forum: 

Hi all.
I am trying to troubleshoot gunk in my charade's oil filler cap. I have been cleaning out the cap for a couple of years now every few weeks so it's not a huge build up, but I would like to get to the bottom of it. The coolant level is stable so I presume coolant is not leaking into the engine. There is never any gunk on the oil dipstick.
Where might the problem lie?
Could it be a PCV valve issue? Does anyone know where the PCV valve is on the 2003 charade 1.0 el?
Thanks in advance for any relevant advice you might have.