I just checked the coolant on my sister's 2006 Ford Mustang 4.0L V6. The fluid looks a little dirty and I can't make out what color it is. The car has 64k on it right now, does anybody know the coolant change interval Ford recommends for this car? also what type of coolant to use and the capacity of this car's cooling system? I would check the owner's manual for the car, but It didn't come with one from our local CarMax.