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So your car asks that the plugs be changed every 15,000 miles or so? copper core plugs degrade over time as the tip wears, platinum tipped plugs wear much much slower but platinum is a poor conductor in comparison so they will perform about like a copper plug would at 10,000 miles only they will be there from the point of new all the way up to 100,000 miles while costing 5 to 10 times as much.
Indexing your plugs will help more then most other after market plugs or wires or crazy ideas.
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