When I opened the box and saw the vacuum pump, I saw a sign that said "IMPORTANT, the pump does not contain oil, add oil before work." I opened the plastic bag to get the pump out but it was covered in oil so I had to wash it. Before I added the oil I noticed there was some oil in it but from the sight glass it was low. When I put in the oil that came with the pump, the oil level didn't rise at all. I don't know if I should use it or order from another seller.
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