Here a question for you experts. I have a old vending machine that had the compressor replaced and filled with r414a.. well after a few years it appears to have leaked out and now i'm considering refilling it with r22. I understand i will have to replace the compressor oil with mineral oil( how much oil should i use??) and make sure o-rings are non-HNBR O-rings. So here's the question...by using r22 does this mean that I won't have the cooling capacity as with r12 or r414a??? should i just stick with r414a or make the switch back(I have lots of r22 and no r414a)