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Evac will only remove refrigerant/air and any oil that happens to come out during the process. My machine will only run an evacuation if the system pressure is over 20 psi. If you want all of the old oil/contaminants removed then you would have to get it flushed which could get labor intensive.
I use the ACR 2000 which is the GM special tool they supply to the dealers. It does everything; Evac, vacuum, charge and flush.
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