What is the primary reason for the "not actual mileage" sticker on odometers?

The primary reason for the "not actual mileage" sticker on odometers is to indicate that the actual mileage of the vehicle cannot be determined accurately. This sticker is applied in situations where there may have been a malfunction or tampering with the odometer, making it difficult to trust the mileage reading displayed.

The presence of this sticker serves as a warning to potential buyers that the mileage may not reflect the true distance the vehicle has traveled. This is crucial for transactions as it affects the vehicle's value and can influence decisions on purchasing and insurance. Accurate mileage is important for assessing wear and tear and maintenance needs, so this sticker plays a vital role in promoting transparency in vehicle history.