I flushed my radiator this weekend and put a jug of Prestone 50/50 in. It started leaking so I pulled the plug all the way out and the rubber seal was bad so I got a new plug. I filled it back up and went to bed. I got up for school and checked it again. The reservoir was empty and I could barely see any fluid under the radiator cap however, the plug on the bottom was bone dry. My dad says that I should have put more than one jug of fluid in it, that the cylinders needed to fill up. Is this true?