What to do when your car reaches 100,000 miles

"It was once a huge red flag: When a car's odometer would hit 100,000 miles, 'it was almost a magic threshold that meant the car was probably worn out,' says Kay Wynter, who runs an auto service center in Fort Myers, Fla., with her husband, Terry.

But thanks to improvements in car design and maintenance, the milestone of 100,000 miles now means something very different."

For more on keeping your car running, click here.