2002 Mustang GT coupe
It's my understanding that the 99-04 stock plugs are platinum. I've heard that they have a life span of about 100,000 miles but iridium lasts 200,000 miles. I was wondering if it's worth replacing the platinum with iridium? I'm not sure if I'll still have my 02 that long. It's been a long time since I changed a spark plug and I've heard that it's a bit different now.