So, while i was at my local Autozone the other day, i was informed that the only replacement spark plugs for my car are iridium. Now i dont have a problem with this, and if i was going to change the plugs anyway, i would only put the best in. But this raises the question, if the only replacement plugs are iridium, then does that also mean that there are iridium plugs already in there? I'm thinking it does, and if there is then im not going to bother with changing them out.
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