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plugs degrade performance gradually - things like oil fouling, rich running and such will accelerate that
even with everything perfect on my car, i can't get 10k out of my plugs before i notice a change, and since i want my car at 100% every time i get in it, i change them more frequently than they "need" to be changed - i also run the best performing plug i can get, which is currently the NGK iridium
same goes for rotor and cap
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