134's cooling ability is 27% less than r-12. You can buy r-12 on ebay no problem, although if you look hard enough you'll probably find someone local who still has it. I paid $160 locally just to not have to do it myself. Man made global warming is an extremely expensive hoax IMO. All cars put out lots of O2. If you really believe, I don't see how you could go on joy rides or race around it circles. Realism is a good thing, although in short supply in todays world. Glad I'm old.