The legal term "general power of attorney" does not exist, but historically, an ordinary power of attorney provides for a limited range of powers (for example, only for driving a car), and a general power of attorney for a wide range (management, purchase, sale, departure of a car abroad, driving, customs clearance... etc.).

It is necessary for the car owner to issue a new power of attorney.

First, the power of attorney is not extended, because when it is issued, the term for which it is issued is indicated, and the procedure for extending it is not provided for by law. Secondly, the notary certifies the signature of the car owner, accordingly, if the owner does not sign the new power of attorney, then there is nothing to certify. Thus, it is impossible to certify a power of attorney without the signature of the owner of the car.

It is necessary to understand that the power of attorney does not transfer the right of ownership, but only gives the right to use the car within the limits of the powers specified in the power of attorney. In the event of the owner's death, his relatives or those persons to whom the owner left a will enter into the rights. Thus, in the event of the death of the car owner, you should contact his heirs.

Any purchase of property is formalized by a sales contract. A power of attorney is not a document that can replace a sales contract. The so-called "purchase of a car by proxy" is nothing more than a means of avoiding the execution of a sales contract, but legally does not allow the buyer to become the owner of the car.