Just find out for sure what they are using and what oil that requires. Not all refrigerants want the same oil.
R12 came with mineral oil. Native R134a was PAG, R134a conversion is typically POE or ester oil which doesn't react badly with any mineral oil that may be in the system. PAG doesn't play nice with mineral oil.
Isceon says this
"Compressors can be charged with most current oils but better oil return will occur with polyolester oils, contact the compressor manufacturer for more information"
R12 came with mineral oil. Native R134a was PAG, R134a conversion is typically POE or ester oil which doesn't react badly with any mineral oil that may be in the system. PAG doesn't play nice with mineral oil.
Isceon says this
"Compressors can be charged with most current oils but better oil return will occur with polyolester oils, contact the compressor manufacturer for more information"
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