If you don't want to put another hole in the valve covers yet,

You can use replace the fill cap with one that has a grommet in the top for this purpose.
Look for 'twist in' or 'twist-lock' fill caps or breathers for PCV valve. Ford-Mercury was a common application here. Replacements come from many sources including Stant and Mr Gasket.
I don't know what's available in the EU.



Last edited by Mattax; 09/28/18 11:33 AM.