Bought this 2.5 cfm vacuum pump for doing lay up work on a RC airplane fuselage. The pump works as expected however the oil that was provided with the pump misted and smoked severely. After two or three uses the oil level was low enough to effect performance. I ordered vacuum pump from HD but it was out of stock, not wanting to wait I had a Bottle of NAPA hydraulic jack oil hand, seems to be 10 weight, gave it a try, no smoke or mist, the pump does leak a little oil out of exhaust but it is not big deal, overall I like it. The low quality is based solely on the oil supplied.