* The buyer is of legal age to enter into a contract (usually 18 years or older).
* The buyer has the legal capacity to enter into a contract (for example, they are not under the influence of drugs or alcohol).
* The seller is the legal owner of the vehicle and has the right to sell it.
* The purchase price is agreed upon by both the buyer and the seller.
* The vehicle is transferred to the buyer in accordance with the laws of the jurisdiction where the purchase takes place (for example, by completing a title transfer).
* The vehicle meets the safety and emissions standards of the jurisdiction where it is being registered.
If any of these conditions are not met, the car purchase may be considered illegal and the buyer may face legal consequences. It is important to consult with a lawyer or legal expert to understand the specific laws and regulations governing car purchases in your jurisdiction.