Ok its not a Ford....sorry!!!! But, what is this? The car is a 1990 Golf GTI MK2. She has oil around 1 of the plugs. The rest are fine.

Pic of how it should look like all the other 3 plugs........




But this is what plug 4 looks like, and its not coming from rocker cover gasket, it seems to be coming out of where the plug lives!!!!!





What could it be, is it bad?

 

More likely to be the corner leaking ie duff gasket and the oil is just spreading that way.
tabetha