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Hi I've just took what I believe to be the original spark plugs out on a 1.4 fiesta duratec 2012 mk7 , the last plug had some oil residue at the bottom near the electrodes and elsewhere but not a lot and the conditions seemed a bit worrying they did take a bit of wiggling to come undone but I'm guessing this is Because of rust I tightened them up to 15nm , as per haynes manual specifications, could anyone tell me is this condition normal and could it indicate anything amiss with my engines internals?
Oh I do use injector cleaners occasionally apparently this can result in some brown tinges on the spark plug
Thanks
 

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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?
 

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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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