However, never underestimate the ability of some garage mechanic to enter/read data wrong. Yes, 95+% of the time they are perfect and don't have any mistakes.... but a friend of mine had a similar problem when selling his car.

People would do the carfax report on it and see the possible rollback. When he wouldn't know what a rollback even was if someone told him... but he does know that one particular garage never could write down his mileage correctly.

He got screwed on the resell by a good $5k because someone else didn't really look at the numbers.

Yea, he should have said something... but he didn't think it would really matter THAT much. He thought it would only effect the particular garages records.