Some people call it odometer rollback.
Others call it clocking or mileage tampering. People buy cars assuming the mileage displayed is correct. But if their odometer's been tampered with, they end up needing unexpected repairs, and somewhere along the line they may discover they lost some money when they bought the car. But others, primarily individuals altering the readings on their own vehicles' odometers, are never discovered. Jimmy Campbell, owner of Procter Automotive Service in Abilene, said he often examines used vehicles for people before they buy.