Hello,
I replaced my spark plugs at the weekend, just out of curiosity more than anything.
All the old ones seemed to look alright except for the 4th (from the left, facing the engine bay) which has this redish residue on one side (please see image).
The head of the engine was originally red so perhaps it is paint + oil? however I am just guessing.
Had anyone experienced anything similar?
Any help /advice is greatly appreciated.
Many thanks,
Sam