I came across this site while researching some new additives. I noticed there was a pretty old thread conversing about the issue, but it is so old!

http://www.refrigeration-engineer.co...-Oil-Additives

I have heard that the original sarcasm regarding additives has quieted down because these products are working.

I have a few clients that are very into energy efficiency and I found this product that counts toward my clients LEED points. Its called SRA or Synthetic Refrigerant Additive by a company called powerknot. (http://www.powerknot.com) They seem to very knowledgeable on this product and in HVAC techniques in general. They even have case studies and I have called a few of their clients just to verify their claims are real. Apparently they are! (This is of course from the other HVAC techs that actually shared with me, you know how secretive we are with our own techniques and products!)

So overall I have already decided to purchase this and try it on two of my clients. I am still curious about your guys opinions though. What do you use? Have you started using additives too? Are you still stuck in the old fashion way of nothing but what the original unit came with?

I'll give you full report once we have had it in the system for a few months!