How do u unseize a 340 motor...or any motor

Have used Marvel Mystery Oil, diesel, and even used oil that I have drained out of vehicles...mixed it with kerosene and let it sit. Check every day or so, keep all cylinders fill and every now and then give it a jarring shot with an impact gun.....just don't use it turned all the way up. You are not looking for torque, just the impact.....