There is only one refrigerant approved for use in vehicles that originally had R12 and this is R134a, period! Actually the United States Environmental Protection Agency had ban the sale of refrigerants that contain Butane or Propane for automotive use. Anyone that would put a refrigerant in their vehicle that contained butane or propane sure doesn't valve their life of the lives of anyone else in their vehicle. We all know about butane cigarette lighters...one little spark and it creates a fire....same with propane grilles, one little spark and you've got a roaring fire. Do you want either of those gases inside your car or under the hood with 8 spark plugs and smoking inside your car?? I think not! You can't go wrong with R134a.
My 2 cents worth!
