Review on Enhance Your Engine'S Performance With Rislone Hy-Per Lube HPL201 - 32 Oz,1 Quart by Michael Jackson

Even though the instructions say to use a quart, I like to use any additive sparingly.

I used about a pint of this with my oil change and it took about a days driving and the one sticky lifter I had quieted down nicely. Can't always guarantee 100% that this was the solution, but that lifter was noisy for a while and other than the regular oil change with the normal brand of oil I use, this was the only change.