Dave;
Oil on the valve cover fins can only come from the Oil Filler Cap...if you have the correct Oil Filler Cap for sealed PCV Sys installed see: https://www.sw-em.com/pcv_diagrams_and_notes.htm ...yours would/should be, the right Cap shown under Oil Filler Caps, there should be NO leakage possible, as everything should be sealed...I'd first verify it seals well to the Valve Cover (this might require adjusting the two bayonet fingers). Check also sealing rubber gasket is present and being loaded up when the Cap is twisted home.
Good Hunting!
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