2007 honda civic, oil life is 60% but i have had the car for over 6 mths, w/...
 

...no oil change. Should i get one?

oil is not going to go bad in six months so if you have not driven your car that much you don't have to change it. But oil changes are so cheap it really doesn't hurt to change it more often then the recommended 3000 miles.















i wouldn't put any oil additives in your oil when your car is so new.