Greetings,

A quick and easy one for those who may know. I am current investigating a sporadic misfire on this Mondeo and I am currently puzzled at the condition of the spark plugs. They are newly fitted correct NGK plugs and after about a week, the electrodes have very rusty coloured deposits. My research tells me that it is due to antiknock additive in petrol. Can anyone verify this please. It is not something I often see.

Regards

Pete M