Where can i fid a list of refrigerant oils that mix with R-134a?

Question

I have a customer with a cooler that another HVAC company retrofitted to R-502 and changed the expansion valves. I intend to replace the expansion valves with R-134a and change the refrigerant to the same. I need to know if POE oil is tolerant of this refrigerant

Answer 1

try this link

http://www.r22.org/