Did it have PTFE in it? Stay away from that, as that is the same $h!& that's in Slick 50!
I have always heard bad stuff about Slick 50 and the PTFE, but when I used it in our 1988 Camry, it seemed harmless.
The Camry is getting ready to turn 300,000 miles (sold to sister-in-law); all original engine & transmission. I ran a treatment of Slick 50 at the 100,000 and 200,000 mile intervals.
Can't say it helped, but sure didn't observe any ill effects either (had a valve adjustment at 250,000 miles and all looked good from a cursory view).