Originally Posted by funola

In my experience, evacuation does not remove any oil from the system. Refrigeration oil is thick, you cannot blow it out with compressed air either since it whips the oil up into an emulsion/ cream and makes it thicker and more difficult to get out. The only way to get all the oil out is to thin it with a solvent then blow out the oil/solvent mixture with compressed air. And you may have to do that more than once depending on method used.