The OP could also look at Duracool or Envirosafe (formerly Freeze-12). Both are hydrocarbons that work slightly better than R-12 and work with any oil (mineral or PAG), and use R-134A fittings. Next time, I might use Duracool's PAO oil, which sounds best (but pricey). There is a lot of information and even more mis-information out there, so read up, and determine for yourself if you need to worry about your car blowing up or catching fire (has never happened, probably extremely unlikely).