They're nearly all, just different blends of the same three basic ingredients... (mineral oil, naptha, and alcohol)...
All,.. will just thin out your oil...
Nuttin' beats an oil n' filter change with a good quality oil...
...
(other, "high mileage, leak stopper" additives, are just variations of motor honey... that thicken oil)... turning your multi-grade oil into something approaching cheap, straight 30wt or 40wt...
That said,... I have used Marvel's Mystery oil in an old Datsun to quiet some sticky lifters... but our bikes don't have lifters...
I add a teaspoon to a tankful a couple of times a year... Just for tradition... doubt if it does much of anything...
Doubt if it hurts much either... (not to my oil)...
... but if you're trying to fix a genuine problem,... best bet is to fix the problem, and not just hope some magic will happen.
As for the hottie with a crank in her hand... I'm sold!...
Seafoam's got nuttin' on that...
...