Do I have 18 spark plugs? The maintenance schedule shows the 4.7 liter needing the top plugs replaced at 30K, and the 5.7 liter all the plugs. I have the 5.7 liter. So, will I be changing 8 or 16?
Can I go longer than 30K with better plugs? Like I said before, my other vehicle has plugs rated for 100,000 miles. Could I use this type. And how would this affect my warranty? (provided I still have one). Thanks John
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