The oil is added before you install the compressor because you may need to hold it a certain way so the fill plug or port is up. Many compressors come with the correct amount of oil already in them. Look for a tag that tells you if you need to add the oil yourself.
Be sure to pull the vacuum for at least a half hour, and even longer if the lines or new compressor were not sealed for more than a few hours.
Wednesday, April 26th, 2017 AT 1:59 PM