Quote:
Originally Posted by 94cobra69ss396
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.
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I used an octane booster before i fine tuned the car. I think that caused the orange color. Car only sees 91 now, mostly chevron. Ill do a quck wot run with the new plugs and then check them out.