i recently bought a car and didnt notice anything wrong with it. then it started mildly ticking in the top end of the car. i got an oil change and it is just doing it worse. its kinda making me mad as i have to have a car to drive to and from school, but i dont want to ruin my engine in the process. car is scheduled to go in on monday for diagnostic tests but i dont have the cash to spend so any imput would be greatly appreciated!