Hi,
   I believe you should avoid PAG oil.  It is not compatible with mineral
oil that may be left in the system and it is generally nasty stuff.  Ester
oil can dissolve moderate amounts of mineral oil and prevent it from
reacting with the 134a.
   I'm not a professional, but this is what I understand from my research
before I did my conversion.

Larry A.

On 8/24/07, John C... <Trvlr2001@comcast.net> wrote:
>
> Hi All,
> I'm converting to 134a,
> and, I need to buy some Pag Oil, but dont know
> What Viscosity of Pag Oil I should be using?
> Anyone know?
> Thanks,
> John C...
>