It is one of the frist suspended silcone engine treatments. I put in highest quality gear lube and one quart of slick 50 to top off. It was the engine treatment not the tranny stuff.
Anyhow after I did this 2nd never missed a beat and even in very cold wheather I could shift the car w/o haveing to use both hands when frist started! This was a 82zx, modifed engine with a 150,000 miles and I was younger and gave it hell all the time, never a prob.
I saw gas milage and acceration inprovements as well as top end. Iam not saying that is a miracle and if anyone trys it I would like to read there feedback.
Since I frist put it in my 86si hatch transaxle with same results, Ive put it in every car I've owned with the same results. On my most recent car, however, it has been energy release, not as impressed.
I cant speak for everyone and Ive tried even redline, but I stand by the results in my own experince.
Btw you could pick it up at any auto parts store, unless their out of busness. Durealube was great but I heard years ago it contained colrine and ate seals. I recomend at least a quart, due to the slight thinning of the gear oil.
My theroy is the syncs are able to catch up faster due to lessening of friction. It is a cheap easy fix if it works for you.