Summer is here. All you kids that decided that A/C wasn't worth giving up for a few lbs of weight on the car, this link applies to you!
I just ordered a case of ES12a for $59.00 from
http://autorefrigerants.com/It typically runs 15° colder than R12, and doesn't have the ridiculous head pressures that the poor excuse for refrigerant "upgrades" R134a has.
This refrigerant is compatible with all automotive refrigerants, so requires no PAG oil or anything else for that matter, other than the know-how to install the fittings, (uses R134a fittings, ironically), and the ability to do a little bit of basic math.
For instance, my van calls for 3lbs of R12. Each can of ES12a is 6oz., whereas each can of R12 is 1lb. The 6oz. can is equal to 1lb of R12, which makes it very simple to figure out.
Hope this is useful for somebody other than me!