after evacuating a mini split system the gauge set lines seemed to be full of vacuum pump oil. On a r-410 system is this something that would be a system killer or just reduce the system efficiency a little if some vacuum pump oil got in the AC system? The pump has a check valve and to my knowledge was not unplugged. The electronic vacuum gauge was showing 140 microns when I closed things off. I did not notice the oil until I had opened the valves on the unit so I can not "check" the lines to see if there is oil. Choices are recover the charge, clean and start over or run it. I do not have the recovery tools or access to refrigerant so not an easy thing to be cautious. The system might be dry or it might have several ounces of vacuum pump oil in the lines.