Quote:
Originally Posted by Nicelyphe
One question though. What would the orange be on the porcelain? Its on all 4
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It's called Corona Stain (seriously) and it's not a problem. It's just caused by static electricity burning up any oil or dirt at the base of the plug wire/coilpack boot.
https://www.youtube.com/watch?v=OvL7oisPn8Q