Will the seller bear a Sharia violation if he sells his car to his friend in his home country, knowing that the buyer will pay a bribe to customs and administrative employees to complete the sale, or if he sells it outside the country and the buyer will pay a bribe to bring it in?

The general rule is that bribery is forbidden, but it is permissible to pay it if one is compelled to do so to obtain a right or to avert harm from oneself. In such a case, the sin rests upon the receiver. The state is not permitted to prohibit buying and selling. Based on this, it is permissible to sell the car and pay money to regularize its status or allow its entry, if this cannot be achieved otherwise. However, this action becomes forbidden if it leads to exposing oneself or one's property to destruction.