Autofrost is a blend yes, but you missed the part about the EPA finally coming to the conclusion about Autofrost being acceptable for Motor vehicle use, which includes cars. If you find it's ILLEGAL, you haven't done your homework, big suprise.

Like I said, In Arizona, It was concluded that if we can drive around with 40 gallon Propane tanks for fuel, There is not much risk with HC's in the AC system. If your not going to bother repairing your system and replace hoses, seals and any other defects, you shouldn't be charging your system with anything. I would prefer R12, But if something else is better and less hazardous, I'm all ears.