As someone that does a lot of refrigeration work I thought about getting some once upon a time. Ive just never needed any though. I know some of the old timers would add it to the system if the compressor was acting up to try and get some more life out of it. The older systems running mineral oil would get carbon build up on the valves if they had run hot for awhile and the valves wouldn't seal good. Adding supco 88 would clean them up Ive heard. Also seem to recall someone saying all it was is kerosene but maybe I am thinking of something else.