Amazing for this price! Sucked a great vacuum, with absolutely no leaks of any kind. You could leave the the vacuum overnight with the valves closed, and in the morning it would still be down at the bottom of the gauge.
But you DO need vacuum oil! And you can get it at the autopart's store. Don't ask me why they sell vacuum pump oil. But they usually do!
If you're trying to boil off water or remove a trace solvent like butane, this is your pump and chamber!