This should be a fairly straightforward job. I don't think you really need to be as strict as called out, but it would never hurt. I suggest that you remove (if not too difficult) the evaporator and condenser and drain the oil out of them. I also suggest replacing the hoses.
Some reasoning:
In an R-12 system, the oil circulates with the refrigerant thus lubricating the compressor and any other moving parts - like if it uses an expansion valve. In an R-134a system, the oil also needs to circulate. However, in the R-12 system, the oil used is a mineral oil, and in the R-134a system, either an ester oil or a PAG oil is used. This is because the mineral oil will not circulate in an R-134a system. So, they use a different oil that will circulate. Unfortunately, the oils used with R-134a have an affinity for water, and will absorb moisture from the air. The hoses used with the R-12 will allow R-134a refrigerant to permeate them. For this reason, barrier hoses are used with the R-134a.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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