Impact wrench oil?
I use the basic stuff from Menards or Lowes. As said, 2-3 drops in the inlet. I do every time I use, & every 20-30 minutes if using continuously. Cheaper than new tools.
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It is probably personal preference more then anything.



they are adjustable usually. Look for a small screw in the top "sight" glass of the oiler. It will be maybee an allen head or a smaller flat head. You turn it either direction to increase or decrease the amount of oil flow. You can view the amount of oil its dripping through the sight glass and turn it up or down accordingly. Make sure the cap is on good and it has a good seal, and make sure if there is a water drain that its not leaking by.







