The replacements are either a blend or a flammable. The flammables are not wise not only due to their flammability, but also the fact that they will not circulate the lubricant as it should for goood compressor life.

The blends are a pain because the only way to recharge if you get a leak is to empty the system and replace ALL of the refrigerant. Also, due to the different components it is sometimes difficult to get a lubricant that will properly circulate with the blend.

There is just no need to use them. R12 is coming down in price. About a month ago, I bought a 30 pound cannister, delivered to my door for $425 total cost. That is less than $15 per pound.

Good luck,