i have always used champion RC12MCC4 in my 4.7 but recently went into the parts store but had forgotten which plugs i had used and they looked it up and tried to sell me platinum plugs. When i first bought this jeep It had been recommended to me to use the Champion plugs mentioned above which is why i have been using them. Seems i remember reading somewhere a while back that i shouldn't use anything other than the above plugs because pre-ignition would occur with anything other than copper core.. Anyone care to chime in with there thoughts?
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