There is no debate about using mineral oil with R134a, it's not a good
idea at all unless you want a new compressor soon -- it's not soluble
in R134a and circulates poorly.
Your choices are PAG or Ester oil, either of which work fine.
Nipondenso requires PAG, don't remember the viscosity off the top of
my heat but it's one of the standard ones. Not sure for other
compressors, but PAG should be fine. Only caveat is that it absorbs
LOTS of water when exposed to air, so you will need to replace the
moisture scavenger (receiver/dryer or accumulator) if the system is
open for more than a few minutes. Just the nature of the beast.
Water makes hydrofluoric acid in R134a, you HAVE to keep the system
quite dry. Also greatly reduces cooling when it freezes out in the
expansion valve.
Peter
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