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I'll probably get scolded by more experienced a/c folks here but I've never really done anything with the oil. I know that whenever I'd assembled a/c system that we'd always put oil in various spots but I've never added any while evac/recharging.
Now if you are going from R12 to R134a I do believe you have to change the oil. My recollection is that R12 oil is not compatible with R134a oil.
Sorry I'm not much help. The ES-12A stuff that I've been using is compatible with both so I just vac down, charge up and go on my way. (which could be 100% wrong way to do it too, but I've no issues in the 3-4 years since I started using it)
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