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Oil and Refrigerant
We all see a lot of questions about dyes, leak stoppers, lubricants, inhibitors, and snake oil. All of those were designed to go into the refrigerant circuit and “improve” something.
I just go back to what Ray Johnson always said. (Ray is one of my early heroes in the biz, and he taught me a lot at Carrier classes.)
“Oil and refrigerant.”
If it isn't oil and refrigerant, it doesn't belong in the system.
Now, I know there are rare exceptions. Heck, Carrier has a tech bulletin from 2014 insisting that Zerol Ice should be added to certain systems due to TXV sticking issues.
But when in doubt… Just oil and refrigerant.