The thing is... the 1 good plug which I drove 15,000 miles doesn't appear to be damage, the one I had before had a broken tip. Maybe I got defective plugs in that 4 pack? I'm going to Super Autobacs right now and getting them Greddy Irridiums Spark Plugs, they're made by NGK. I can't be having this sh!t in my cylinders it's not worth it.