Yong Heng break in?

i left the bleeders out for about 5 minutes, let it run, let it cool a few, and did that 3 times and let it cool completely off the last time before i set it up to fill the first time ... also, its good practice 'after' your all done for the day or whatever to pull the bleeders ALL the way out and let it run to cook off any moisture in the system ... this is classified information .. consider yourself one of the lucky ones lol ....
 
I love mine. I made the mistake of not using the air breather on the oil fill port. Luckily, after months of use, I had no explosions. Someone's looking out for me !

I have the air breather on now. 

I used mine one time and changed the oil based on the advice of others and also because I bought a gallon of O'Reilly AW-46 hydraulic oil for $16 bucks. Then, I changed the oil after every 5 fills. Probably not necessary, but why not. 

I've had mine for well over a year now and it STILL runs like a champ. I keep a gallon of distilled water in my fridge with the two hoses sticking out of it and the pump in it. I cut a slit near the top to fit the pump. It's a fish tank pump. It's made to be permanently submerged in water. I can fill three rifles empty to full at one time and the temp never goes over 40 celcius, which is around 100 degrees. 

I did notice by not using the oil breather cap I did spring a leak somewhere, so I need to fill it once a month or so to keep it full. One of these days I'll take it apart and do a full gasket rebuild.

Otherwise, brother, just enjoy it and have fun ! If you're scared to hit that on switch for the first time, don't worry. I was TERRIFIED. 
 
That is minutes. First oil change in anything mechanical is going to be short. Lots of particles of metal and junk in there from the manufacturing process. You need to get them out of there right away to avoid damage and excessive wear. Oil was black I could barely see the dot. And that was some clear oil when I put it in. I changed it again at near 8 hours the next time and not since with 20 plus hours on it now. I may not change it for 50 hours this time if the compressor lasts that long, Depends on what the oil looks like.

With the first oil change oil at 50 hours and top temps often at 75C I really doubt the compressor would make it to the fifty hour mark.
 
When I got mine, I just forgot to give it a good no pressure run in. I went directly to filling cylinders on the gun (not a tank) and changed the oil after about 10 fills. It has been about 3 years and it is still going strong. I would most certainly give it some no pressure run time if I could do it over and change the oil sooner. It doesn't take long for the oil to get real dark on a new unit.