I have a 2001 focus and what happend to mine was the valve cover gasket was leaking on to the spark plug... was it just the plug or the boot as well.???
Oil residue on plugs is never a good thing, usually indicating excessive ring wear or other major internal problem (read:expensive) But, first, check that any engine venting system (pcv, cover vent etc) is clear and not building crankcase pressure, then check compression or cylinder leakdown test. Also make sure that you do not have a problem in the fuel system that you are mistaking for oil on plugs.
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