I just pulled my plugs and found some problems. Not long ago I accidentally put in 7 gallons of 87 octane. When I pulled my head out of my butt I stopped and filled the rest with 93. I then put in some octane booster. It didn't ride to well but I babied it until I went empty. Then today, my car got pretty hot. My temp gauge still read half way? I just installed a new radiator and was told I most likely have a bubble at my temp sender. Anyway, my plugs are pretty redish and the two on the top at the left are missing part of them as well as some porcelin. I am more concerned with the metal fragments causing me problems?