the go to additive at one time [at least around here] was the GM stuff.
some now recommend jeep brand additive.
what's the difference ? i don't have a clue.
what i do know, however, is that adding a container of the "strange" brand additive cures a sticky lock up converter clutch !
that worked perfectly in my wife's 94 concorde front drive transaxle.
i don't know where i heard about that, or who told me, but i couldn't believe how good it worked.
just my personal experience in life.
your results will vary.