Reading plugs

I havent ever seen plugs that have this coloring? kinda confused, i have read one thing that says they are ideal for daily driving and other things that say they arent good.
As far as i know plugs have less that 4-6K miles on them. Mostly highway driving at 75-80 MPH. what do you guys think?
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I havent ever seen plugs that have this coloring? kinda confused, i have read one thing that says they are ideal for daily driving and other things that say they arent good.
As far as i know plugs have less that 4-6K miles on them. Mostly highway driving at 75-80 MPH. what do you guys think?
seriously, about the plugs tho, im not sure. im sure someone here will be able to chime in.
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