Originally posted by "2qk4u"
if the oil is on the TOP of the plugs then it sounds like the
o-rings on the valve cover are toast, and are leaking down onto the
plugs.
if your rings are going,you would have white smoke constantley out the tailpipe.
just take the valve cover off and take a peek.
had that happen before...it will drain into the cylinder and foul the affected plug. time for a new valve cover gasket & plug gaskets