My company is removing two of these screw machines which are Dunham-bush mod. PCX290-OHR 1979 chillers and I am trying to find out how much oil they hold as my guess is about 80 gallons. I tried to find a O+M maunal but had no luck. We removed the R-22 Freon today and it had 355 lbs in it. Thanks for your response in advance.