One of these days, I'm going to try the mixture myself. Today, I actually met someone who recently was able to get the motor unstuck on an Allis Chalmers tractor. Someone had removed the muffler and rain water filled some of the cylinders up. The owner said that he had just recently purchased the tractor and was able to get the engine unstuck in less than a week after allowing the 50/50 mixture to soak in the cylinders.
First, he removed the spark plugs and used compressed air to blow out the water. Then he filled the cylinders completely full of ATF & Acetone. I'm assuming he put the spark plugs back in to keep the acetone from evaporating and from unwanted things getting in. Several days later, a helper used a prybar to apply force to the flywheel while the owner bumped the starter. Of course, the spark plugs would have to be removed again in order to allow the liquid to have a place to exit. In a short amount of time, he said that the pistons began to move. After the mixture of ATF & Acetone was removed, the plugs were replaced with new ones, new points & condensor were installed, the carb was cleaned, and fresh gas was added. The man said that the engine fired right up.
There's an Oliver 88 and a JD 730 that I need to try the 50/50 mixture on. I'm also going to try using hydraulic pressure via a hollowed out/modified spark plug to see if that method will work.