So, you just bought your first car. Or, maybe it is your sixth or seventh vehicle. What is next? If you believe all you have to do is fill it with gas, think again.

Mechanics say if you want to keep your car running smoothly, take care of it. Research from the Car Care Council in Bethesda, Md., a nonprofit advocacy group, confirms that nine out of 10 vehicles on the road are in need of routine maintenance or repair.