Which oil to use for r12 freon?

[vandor]

Not sure where to post this...
I am converting my Spider's A/C from r134a to r12. The system will be completely flushed, new drier, etc.
What oil do I use? I heard Esther oil works, but the one available at the parts store says it's for r134a systems that have been converted. It also has 1 oz. of 'performance enhancer', and I am a bit nervous what that is, and is it compatible with r12.

Does anybody know for sure?
Thanks,

[racydave]

Mineral oil is what was used on R12. I think O'reilly carrys it. Maybe Auto zone.

[majicwrench]

Did I miss something?? You are going back to the old style R12?? Why??

[vandor]

OK, I found mineral oil at NAPA. O'reilly did not have any.

I am going back to r12 to improve system efficiency. It looks like the small size of the X1/9 evaporator in my system is the limiting factor (no, not the condenser), so I want to see if r12 will improve things before I try to fit a larger evaporator in the box (which would be a huge pain).

[racydave]

Try running your AC with a house fan in front of the condenser to see if the added air flow helps. ???

[vandor]

I have tried 100 things a lot more complicated than that...