It depends on the make and model, but generally, people mean over 100,000 when they say “high mileage.” J.D. Power considers 200,000 the “upper limit” for buying a used car. It also depends on how well the car is maintained. For example, transmissions last 150,000 to 200,000 miles; timing belts usually need to be replaced every 60,000 to 100,000 miles. Most people drive between 10,000 and 20,000 miles per year, for reference. We recommend an extended car warranty for vehicles with more than 100,000 miles if you own a quality vehicle and are dedicated to maintaining it.