Caution is also advised when viewing in person, as the seller will certainly provide access to see the car, but is not obligated to direct your attention to all the defects he is aware of. Even if taking a friend, your friend may not know what to look for any more than you do. Ask all the questions you can think of, and have the seller list the modifications he’s done, to help in future maintenance issues that may arise. You’ll have a period of discovery ahead of you, you’re better off garnering all the info you can before you complete the transaction.