The process to change the primary name will depend on the state that you live in. Contact your local license plate agency, they can give you the information to make the change easily.
use the purchase price
A vehicle can be titled without insurance, but must be insured before getting a tag or registration. Exception: If a car still has a lien from a financing company, the car may have to be insured to change owners.
Per owners manual for your car
No it does not give previous owners personal information.
Refer to your owners manual.
It will not be registered in your name. They sold it and will register it in the new owners name.
If she is the primary owner she would have to go get it changed, or you can try to have it removed by going to the DMV and requesting a title change.
Follow the recommendations in your owners manual or change it every 5,000 miles.
No. If both parties are listed as owners, then both people own the car. Changing the title will require a personal visit to your local motor vehicle department - both parties must be present in order to change the names on the title.
All of the owners of the car have to sign to transfer it or sell it, and that includes donating it.
You do not wait for some symptoms. You change the filter at regular scheduled intervals as listed in your owners manual. Don't have an owners manual then change it every 50,000 miles.
If you cosigned for the loan you are joint owners of the car.