If the plug wire did not seal the well properly, the oil may have accumulated over time.
Otherwise, the seal on the valve cover is probably starting to leak.
This assumes that the oil was on the THREADS of the plug.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
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