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Here's a little trick to get more life out of them: The prongs and rotor tend to char within 15K miles, so I do a mini-tuneup at that point. I change the plugs, PCV valve, air filter, breather filter, rotor; and then I remove the wires from the cap, rotate the prongs 180 degrees and re-insert. I use the pristine back side of the prongs for another 15K miles before replacing cap and rotor along with the rest of that list (and gas filter).