Just like Sweet 16 or the Big 4-Oh, a used car has significant turning points in its lifetime. In the case of a used car, these aren't birthdays but instead mileage milestones, and they can affect the car's value. If you're planning to sell or trade in your car soon, keep your eye on the odometer and sell before hitting these significant mileage points. If you're buying a used car, you should also know about these milestones and understand that extensive maintenance may soon be due — or should have been done already.
While the mileage always affects the price of a used car, and is factored into the Edmunds.com True Market Value (TMV®) appraisal tool, three mileage markers have a greater impact on a used car's price. Here's the breakdown