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Ammonia in all the seized engines that I have used it in have NEVER damaged the pistons... And all of the engines that I have used ammonia in were stuck due to water getting in the cylinders and causing rust.

I have used Ammonia to un-freeze a stuck motor, worked rather well on old tractor engines... after I get it unstuck remove Ammonia and put marvel mystery oil in and rotate the engine slow several times rather slow and let sit turn some more and add oil and turn some more and let it sit a while...