Yes
STP
Pro-Ma - a micronized lead/tin/copper that did really well on the one armed bandit.
PMT - a Teflon based lube in the '80s (NASA on the logo) it certainly DID increase compression and lower oil consumption.
Nulon E10 - a Teflon based lube, added to a ford 250 ci six with a gazillion miles on it. halved consumption
Slick 50 - did nothing, while the other two did something
Lucas - because it has no additives, I used it in turbine maintenance
Morey's (Lucas with antimony additives).
Lanolin (while I was waiting for my autoRX)
Auto-Rx - did nothing
Ethyl ester of rapeseed oil (I made that myself from scratch, about a gallon - a bit similar to a Scheaffer product give or take) it did some cleaning, but I got scared of the potential seal issues)
Rislone
Canola oil (cheapest additive I've used - nothing blew up which clearly vouches for it's superiority)
Early on, diesel, to help desludge engines...again nothing blew up, but I couldn't dismantle enough stuff to get the gallon of black goo out of it.