Is relinquishing a car without compensation considered a way out if the questioner does not remember whether he swore by divorce not to sell it for less than 13,0, and at the time he was afflicted with obsessive whispers of self-talk?

As long as you are not certain about the oath of divorce, there is nothing upon you if you sell the car for less or more than the mentioned price. There is no need to transfer ownership of the car without compensation, as excessive caution in your situation is blameworthy. For "if it leads to that, then caution is to abandon caution."