Ask and ye shall receive! MY FSM says replace every 30,000 miles. That's for 93 Jeeps XJ and YJ, 2.5 and 4.0. Same thing for the rest of my Wrangler FSM's 98 - 04, replace plugs every 30,000 miles. I ain't sayin' I do it but that's what's recommended. <img src="/forums/images/graemlins/cheers.gif" alt="" />