I bought 3 cases of one pound cans of R12 in about 1990 and stored them in an old freezer (not working). At the time I had four vehicles with AC that used it. The other day I decided to check on them and almost a third of them had nothing in them. They weren't rusted either. I think the original seals where the caps were installed dried (?) out. I think the rest is still good.
I also have almost a pallet of antifreeze that's now about 30 years old. I understand it's not wise to use this in anything modern. I did use ten gallons, five in each tire with water, in my 8N Ford. Seemed like a waste, considering what that stuff used to cost. On the other hand, my cost has been lost many years ago, and I was glad I thought of using it. I guess it would be OK to use in my tractor as well, but I didn't. Put new stuff in it instead.
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