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I do not think the oil for the compressor is or should have to be counted on to seal the system.... as NYLOG of the proper color would be used on the o-rings and gaskets as the system is put together..
So the nitrogen would be used with the oil already in and spread out ..... do nothing except provide pressure and a SNIFFABLE refrigerant ( R22) to use as leak detection...
The compressor is not going to be used until the system is certified leak free...and the proper refrigerant is installed... so that can be used to carry the lube around and keep the compressor lubricated.
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