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Changed my plugs today and noticed the insulator is yellow? I've been running a good amount of c16 mixed with 93 could that cause the color change? Or is it time for a colder plug?
 

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yea the c16 is changing the color. anytime you put an additive in the fuel whether it be the fuel itself or an octane boost, you will notice a color change on the plug insulator.. usually the tip will be an orange-ish red color but sometimes other. how far up does the color go? not past the threads right? if it does, you have a different problem
 
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