So then, since now I'm talking about more than pulling out a few ounces and worried about the integrity of my refrigerant given the history, if I recover all of it and refill with virgin R-410A it poses two additional questions:
1. Being unlicensed, will I be able to find someone to whom I can take my old refrigerant for disposal?
2. I never worried about oil since I always reused the recovered refrigerant. Can I buy another tank, connect the system to its liquid port and connect that tank's vapor port to the recovery machine input and connect my other recovery tank to the machine's output? Will that place the oil in the first tank, and then do I buy an injector and place an equal amount into my system?
... or how forgiving is R-410A? Because I'm getting a headache, lol.