I was reading over the 1998 Ford Service Guide. It calls for coolant replacement at 50k then every 30k. OK I got the 50k coolant replacement at FPS. Unlike the V6 the V8 does not trap air so coolant replacement is easy. I just turned 80k and was surprised I needed a coolant change. Got 50k, 80k, 110k, 140k? How many times have you changed your coolant?