Coilcleaner, I am not going to respond to your posts anymore. Zw17, our vendor in Milwaukee that handled chillers recently closed their chiller division and an outfit in Chicago is now handling the chiller division. I was not able to get a response from tech support today. The oil return on this compressor is pumped from the condenser bundle back into the compressor. Currently I have the oil laying in the bottom of the condenser bundle. I have both the operation manual and the service/maintenance manual, and the only info that they give is adding additional oil to the system but nothing about removing/changing the oil.