I have contacted two dealerships and asked them if the 4 cylinder in my car needed to have the timing belt replaced periodically. One said yes and the other said no. So I called customer service and they said that they would look into it (another way of saying "I don't know.") and get back to me. There is nothing in the owner's manual that I can see that says anything about the timing belt. This has been a great car and I would like to keep it that way. It would be a shame to have the belt snap, destroy the engine and then have Hyundai deny the warranty repair because I didn't change the belt. Does anyone out there know?