Review on Champion Copper Plus 443 Spark Plug – Performance and Durability in a Carton of 1 by Jason Pinkney

These are OEM spark plugs for my Dodge Stratus. Do what they are made for. My Subaru Forester taught me how to use OEM spark plugs. I upgraded the Forester to platinum spark plugs and the engine would idle intermittently and periodically stall. Went back to OEM (copper core) and had no problems. I know two different cars but have been told that ignition systems can be designed with specific spark plugs and may perform poorly if you use a different style due to the voltage requirements of the spark plug. From what I've been told, my experience shows that it can stand up to criticism.