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Need help of choosing the best spark plugs for my 2003 Dodge Durango 4.7 liter. Is there a major difference between copper or double platinum? Horsepower etc.
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N0pe:
Welcome to DDN. The oem Champion Coppers are recommended. I ran the Champion Platinum equivalent in my '01, and they ran fine. Some 4.7 owners though, reported drivability issues when running other than the Champ Coppers, and went back to them.

Don
 
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