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Be very wary about pouring liquids into a running engine as it can cause a hydrostatic lock and then it is game over.
I don't believe in most engine rebuild in a can snake oils because they simply cannot replace worn metal and tolerances and only serve as a short term band-aid. Sticky rings can usually be freed up with a couple short interval oil changes.
I do recommend Sea Foam added to a full tank of gasoline for safe carbon removal. When I first tried Sea Foam, I experimented with it on an air cooled Duetz diesel that had severe carbon build up and when I tore the engine down, the combustion chamber and valve stems were amazingly clean. I have had consistently good results with it in the commercial fleet that I maintain.
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