Do you bleed the oil moisture bleed screw every 5 minutes as well? When I first got my yong heng I was bleeding both.The bleed screw is opened before you start the YH so it doesn't start against pressure and opened before you shut it off so it doesn't shut down against pressure. I also open it for a second or two every 5 minutes while filling my 45 minute SCBA tank to vent moisture. It doesn't bleed oil, it is to drop pressure and while the pump is running for a decent amount of time it vents moisture that builds up.
Moisture builds because air at high pressure cannot hold much moisture unless it is quite hot. The pump makes it hot but then it cools as it flows to the gun or the tank and the moisture comes out. The stock filter that comes with the YH is very useful and for filling a gun might be good enough. But I use a smaller extra filter with color change absorbent beads in it. A one way valve is a good idea, I think, on the outlet of the extra filter. That keeps you from losing the air in your gun or tank if something goes wrong with the pump or filter and it also keeps the gun or tank from pressurizing the YH while it is trying to come up to pressure. They are pretty cheap, you can get them and the YH and the extra filter on Amazon. I used Amazon for YH largely because they are so good about returns. I use Nuvair oil in mine and it has performed well for a couple years now. It normally fills my 45 minute SCBA tank (66 cubic feet) in about 15-20 minutes. Filling a gun should be a minute or two for a small one and no more than 5 minutes even for a big one. For filling your guns or little bottle you shouldn't need to make any long runs. I fill my bottle about once a month and change the oil once a year.
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