Country of Origin: United States
Does a vacuum pump or a refrigerant recovery machine also remove the oil from the system?
Yes and no. Varying recovery machine designs, vehicle system designs, system volume, port locations, ambient temps, and many other factors; all come into play.
If the refrigerant is removed as liquid it will most probably have oils suspended in it. If it is removed as a gas, it will be leaving the oils behind in the system.
In a recent test on a Toyota Prius, which has the ports located at the highest point in the system, and only uses 1 lb. of refrigerant; we recovered (and recharged) this system 5 times with a fairly new Snap-On RRR machine and had no measurable oil removal occur.
Would there be any problem in adding 5 more ounces of oil just to be sure?
That will be helpful.
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