Pierre,   You can put the MMO in your gas to act as an upper cylinder
lubricant as it will dissolve gummy deposits on valve guides, rings etc., or
you can put some in the crankcase to dissolve gummy deposits in valve lifters
etc.
Some people have had great success by putting some down the spark plug holes
of each cylinder and leaving it for a couple of days as it is so good at
getting rid of deposits,  usually helped by a good blast down the freeway
right after.   Sort of like a decarbonizing process.     With todays gas that
may be less necessary as they tend to have solvent additives in them to keep
injectors clean.
Some people like to pour a little down the throat of a carburettor or suck
some in a vacuum pipe at a fast idle as it can clear up some rough running
problems due to deposit accumulations.  This tends to fog up the neighborhood
though!
Il faudra l'essayer cette huile une fois.   Tu pourras etre surpris par les
resultats!
Steve