I know they say to change antifreeze some. I have never changed it in anything, from farm tractors to hemi`s, and have never had a problem . If it`s dirty or rusty, I`d change it, don`t remember any of that. wehen I have to add antifreeze for winter, I use the stuff that will mix w/ either one, and usuall keep it 25-40 below for protection around here. "a little overkill ".
