I knew a guy who liked to restore old farm tractors. He would buy old tractors with seized engines and winch ( drag) them onto his flat bed trailer. He would pull the plugs and pour on MMO. He would put it into gear either reverse or third gear. He would chain it loose on the trailer and then drive it back home. The constant rocking and jerking against the chains would free up the engine by the time he got it to his home.