Just thought I'd say this about any refrigerant that is a blend,as opposed
to one that is just one chemical..A blend will act kinda like a water-oil
mixture. The lightest chemical will leak out first(all a/c systems
leak).Soon, you will have an imbalance of refrigerant concentrations,or
basically just one chemical left(usually 134a).Also, there limited way that
a blend can be charged into a system.If you add a 12ounce can, you must
charge the whole can, or else the seperate refrigerants will be charged at
percentages other than what the blend is supposed to be.134a is not a
blend. R-12 is not a blend.Most of the others are blends.they usually have
a "base" of 134a, or R-22.