STP?

[Photon440]

I thought it was Scientifically Treated Petroleum.

It was, originally. Then it was Studebaker Tested Products after Studebaker bought the company in 1961, and until they spun it off in 1969.

 

[Jeff Peterson]

Lucas before there was Lucas.

 

[WileE]

It's..... THE RACERS EDGE !
still around here, advertised as high zinc content on the bottle.
All joking aside we used it as engine assembly lube for years with zero problems.

Slippery stuff, use it when pressing close tolerance parts together.

As an impressionable youth, since King Richard promoted it, I used it. And, still do, 50+ years later. We also offered it way back then as an add-on in the garage for a customer oil change.