And it's going in my Truck and 81 Vette.
My mechanic got me two cans as he use to add it to vehicles w/R12 that needed a little charge. I hope to put it in tomorrow or a few days.
If your mechanic wants to be stupid and risk a massive fine from the EPA, that's his business. Personally, I wouldn't Mix the stuff in as it's a violation of federal law , I'd get slapped with that big nasty fine , and probably loose my license.
If you want to do it right, it's not that hard. you can take the test
here to buy R12 legally and it's an open book test, Kind of a no brainer. THey just want people to be made aware of the realities of refrigerants before cutting everyone loose with them, they really aren't being unreasonable about it. Heck, I had worked in an auto AC shop years and years ago ( way before r134a ) so just for fun, i took the practice test without even reading the book first and passed it , Aced the actual test .
If you keep it R12, you system will not be contaminated , and your vehicle will be able to be serviced by any shop that works on R12 systems. That is a valuable thing.
If you put freeze 12 in it and then If you BSd someone into servicing your system some years down the line by not telling them, or if you sell the truck and the next owner doesn't think it's important, that would be seriously uncool, because if their detector didn't catch it, their recycler would, because all the r12 they pull goes into a tank and then when done with a vehicle they re charge the vehicle from it after it gets filtered, but gas gets mixed in the tank, it should be all r12, but if somehow freeze 12 gets mixed in there by mistake, that poor shop owner has a bottle of toxic waste on his hands, instead of a bottle of recycleable r12 that can be cleaned and put back into circulation. seriously uncool. the recycler sends the man a big fat bill for having to deal with his toxic waste which adds up to more than what he made on the job fixing your ac system.