Quote:
Originally Posted by C5Natie
Many pictures on those type of charts are either vague, low resolution so you cant see, or extreme cases. The ones in the link posted are a bit better. I just wanted to see if others agreed that they seem like plugs that were too cold for the motor. Also think the orange brownish color is from running octane booster at the track.
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It's too hard to tell the heat range with that many miles on them. Put a new set in make a quick pass and them inspect them. The red/brown color is why I asked about the fuel. The additive would be the cause.