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Which Is Better Copper Or Iridium Spark Plugs? [Solved]

Platinum and Iridium plugs perform at a lower level than copper spark plugs, because they are less conductive and they tend to overheat. However, the overall longevity of these two types of metal is better than copper plugs. In reality, copper has the best performance of all three and the worst longevity.27 Jan 2012

Stop Using iridium Spark Plugs! Copper Spark Plugs are Better - Pro Tips with Robby Joe Bob

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Cooper vs iridium spark plug @El Chano Jose

NGK

Best Spark Plugs for Performance!

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