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.