I'm sure this is one of this "are you serious?" questions, but however I'm in class and don't have my manual next to me, so heres my question. my car has 15k miles on it, and the coolant level was about a half inch under LOW. I've never heard of my parents having to add coolant to their cars? Is this something the dealership does during oil changes? Is coolant even supposed to need to be replenished? Do I need a certain type of coolant? (brake fluid, i needed a certain DOT 4 or 3, i forget which) any help would be great.