oil on sparkplugs

Hi, I have a 1998 Ford contour 2.0 DOHC 123000 miles which runs like a charm. I decided to replace the sparkplugs( it was due). The sparkplugs were coated with some oil when pulled out. The car starts fine, does not run rough, and does not burn oil. I have done some research online and some suggestions were to replace the cylinder gasket and/or sparkplug tube gasket. It sounds like an easy fix but i just wanted to know if there was something else i should be addressing. thanks for any input.

sounds like the same problem I had with a 2000 focus and currently having with my ''97 contour.I replaced the valve cover gasket on the Focus problem solved,as soon as I can afford to do it I''m going to change the Contour . Money''s tight laidoff