Identical original candles replaced by these. I thought it would be a good idea since my car had 157,000 miles on it. Three of the four old candles were clean. One looked like a piece of the electrode had come loose, but it still worked fine. I had no error codes. After that I didn't notice any improvement after driving it the last two thousand miles. But I felt better. I think these spark plugs could easily run 200,000 miles or more.
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