The director of finance shall file each application received and register the vehicle therein described in a record or book to be kept by the director of finance under the following headings:
(1) Vehicle registration number;
(2) Name of owner; and
(3) Vehicle identification number.
The director of finance may microfilm vehicle registration and ownership records which are a year old and may discard the original records. The director of finance may discard vehicle registration and ownership records which are older than six years.