Has it been running fine? Chances are good it's just a valve cover gasket.
To clarify your post, it doesn't look like the cylinders have oil in them. It just looks like the spark plugs have oil on them.
'04 Mach 1. Built. Turbo. 667whp/631wtq
'06 Focus. Built. Turbo. WMI. (sold)
'03 Mach 1 : 12.61 @ 106.59 (sold)