Contour Enthusiasts Group Archives Forums Modifications Zetec Maintenance doing a radiator flush on a zetec

I'm curious to know how long Dex-Cool will last (obviously you can't tell yet) since a mechanic friend of mine (good mechanic) told me that Dex-Cool has a tendency to crystallize & break down over a shorter period of time than expected. He recommends changing at least every 50K......my $/02.....