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The in-line tool oiler works on the same principle as adding oil to the back (large cylinder) of the airpak, the oil mixes with the air. The large cylinder acts as a reservoir (like the in-line tool oiler). Adding oil at the "front" of the unit makes sense, but then you'd need an actual in-line...

Use air tool or hydraulic oil, both low viscosity oils (about equivalent to engine 10W oil), easily mixed up by the air currents to lube the valves within the airpak...