Tire sensor fault in 2006 ford explorer

If you have never changed the tire sensors since new, the batteries in them are dead. They usually last eight to ten years. The owners manual for my F 150 states to change the engine oil every 7,000 miles. I change it every 5,000 and reset the system. It always comes on again two or three thousand miles prior to the 7K required. My best guess is most people act like robots an when a machine tells it to do something, they normally do it. Nothing but extra money for the dealership if people run to the dealership to change the oil when it doesn't need it.