Pulled a plug off the top of one of the sparkplugs and theres oil in there?

Its running fine but what does that mean?

leaky rocker cover gasket? check you valve lash recently? ... if not, might be time to do so.

Oil in the cylinder is usually either bad rings or bad valve seals. I'd do a compression test.

Do you mean there's oil on the top (exterior of the plug), or on the business end?

If it's the top, you have a leaking valve cover gasket. If it's on the electrode you've got other issues, and you're probably seeing a lot of blue smoke. That's rings.

Do you mean there's oil on the top (exterior of the plug), or on the business end?

If it's the top, you have a leaking valve cover gasket. If it's on the electrode you've got other issues, and you're probably seeing a lot of blue smoke. That's rings.

Its on the exterior of the plug

Running very well though, good mileage and no smoke whatsoever

I don't know how conductive oil is but you might be losing some spark to ground.  I'd be more concerned about the wires getting oil on the insulation - quick way to wreck wires - but that is probably not happening here.  Alternatively, if you don't mind a little Exxon emulation, you could just leave it to slowly weep until you do your next valve lash adjustment. 

cool, thanks for the info