Just for the record,  this stuff is sold in the UK as Redex and has long been
touted as an upper cylinder lubricant.     It does a good job of freeing
stuck piston rings as it will dissolve the gumminess.   I have also used it
to free sticking valves and noisy lifters.  I have seen it improve the idle
on some rough running cars by pouring it down the carburettor intake a little
at a time.
I dont know what it is made of or how long its been around but I like to have
some on hand for all kind of odd jobs.   I dont own an automatic so I dont
usually have atf on hand.      Somehow I feel sure that atf has an additive
package that probably the MMO does not have.

Steve
Columbia  SC