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2017 Mondeo ST Line X hatchback 2.0 TDCi 180.
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I would replace the leads as well and use a small amount of dielectric grease to help seal them.

When were they changed last?
id guess theyre original as from memory the plug change on the Duratec was something like 10 years/100k miles or possibly even 125k miles or something absurd, as theyre platinum tipped plugs.
 
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