You can ask for a change when the mileage is right or when you get a signal from the vehicle's electronic maintenance reminder.

WSJ: Me & My Car: Is It Better to Buy a Used Car Rather Than New?

On the night of July 23, 2011, when trains began to stack up, dispatchers and maintenance staff raced to repair the faulty signal and ignored the simplest solution: stop the trains and regain the signal.

NEWYORKER: Boss Rail

First of all, every commuter rail system has full time maintenance crews, and they always have plenty of work: changing lightbulbs in the tube, fixing a signal that got bumped, replacing an on-track communication cable that was vibrated out of place and smashed, etc.

FORBES: Why Does BART Need To Do Nightly Maintenance?