There is oil in the ignition coils, it could be that is leaking out.
A good quality of set of uprated coils is £200 and are well worth the money.
If you read on the Ford forums many people across the pond find the coils can start failing from 60k. While at it unless you have a record of when they were last replaced pop a set of plugs in at the same time with some copper grease on the threads.
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