I have an 11 f150 with 125k. When I first got it it had 114k... i bought some platinum motorcraft plugs and when i changed them i noticed it had stock iridium if i remember correctly. I was going through rock auto and noticed that it didnt offer iridium motorcraft plugs, and advanced auto didnt either. But I swear when I bought the platinum last spring there was an iridium option (I went with platinum because that's what I thought was stock, correct me if I'm wrong)... is motorcraft not offering the iridium plugs anymore?