In law there is no such thing as a Primary owner, and a secondary owner of a motor vehicle. If there are two names on a title, it is considered to be jointly owned. The only difference that could be on a title is if there is a place where it can have either 'and', or 'or' between the names. If one of these words can be placed on a title with two names, that would make a difference in the sale of the car. What it would mean is that either both would have to sign the title to sell the car if it had 'and' between the names, or it would mean that either one could sell the car if it had 'or' between the names. In some states the vehicle titles do not have a place for either of the words. Instead they might just list #1 driver, and a #2 driver. Some even say Primary, and Secondary. All these mean is that the #1, or the Primary is the one that is most often using the vehicle. Even this can change without the title being changed as to who is driving it the most. However, the vehicle is still considered jointly owned. IF there is only one name on a title, it might also be legally held to be owned jointly. This all depends upon certain other state law on community property, or if there exists a document of joint ownership with rights of survivorship between two people.