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30k old copper spark plugs. One of them has more carbon buildup. Should I be worried? : r/AskMechanics
4 Types of Spark Plugs (Copper Vs Iridium Vs Platinum Vs Double Platinum) PDF | PDF | Vehicle Technology | Manufactured Goods
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30k old copper spark plugs. One of them has more carbon buildup. Should I be worried? : r/AskMechanics
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