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are copper spark plugs good, are copper core spark plugs good, best copper spark plugs, copper spark plugs better performance, are platinum spark plugs better than copper, copper or platinum spark plugs, copper vs nickel spark plugs, copper spark plugs vs platinum, are some spark plugs better than others, spark plugs good or bad, copper spark plug wires, how long do copper spark plugs last, copper spark plug lifespan, copper core spark plug, best kind of spark plugs, what makes a good spark plug