Cataclean

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I do not know if this one does work but over the years I have seen all sorts like stuff for freeing your piston rings and stop the smoking now if a engine was smoking through piston rings the only way to do that is renew the rings and so on.
 
Not convinced that sort of stuff does much. A good old fashioned duel track blow out helps mine was part blocked so I made sure it would never happen again if you know what I mean ;)
 
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