I have about 3500 miles on my civic, I remember the salesperson that sold me the car that I should get an oil change around 3500 miles. I called up a Honda dealership and the person told me that I'm not due for an oil change until a sign comes up saying I have 15% oil life and I need an oil change. Right now, my car sais I have 50% oil left. What should I do? Should I change the oil or just wait for the sign?