To move the system beyond deferred to preventive maintenance would take more than $1 billion.

Most people aren't buying it for preventive maintenance because it's not cheap.

When you have a program of preventive maintenance for cars, there's no reason why a car can't go 200,000 miles.

They were unable to decide on (or maybe fund) any necessary preventive maintenance work.

Preventive maintenance, where equipment is maintained before break down occurs.

And that's what we provide - preventive maintenance for cars.

"We do preventive maintenance on our buses regularly," he said.

Preventive maintenance was not performed, although it would have been relatively inexpensive.

"It'll help us determine where work has to be done immediately and how to do preventive maintenance to stop roads from breaking up."

For instance, Windows 98 automatically carries out preventive maintenance in the middle of the night.