Hi Erlis, I have an Omega Air Charger and the only maintenance is to turn the grease knob 1 full turn about every 6 hours of use or 1/2 turn every 3 hours. Todd recommends to not over grease them, that can cause issues. I've had mine since September 2020 and it's been great. I only fill my SCBA tanks to 4200, less stress on the compressor. I also have a shoebox F10, and it's also great but slower. For the Air Charger, I recommend an hour meter, they don't come with one. I put on an analog hour meter to keep track of hours for maintenance, took about 20 minutes and works only when the compressor is working. not just when the unit is turned on. It's a no frills compressor but if you are on a budget, it's either that or the Hill EC3000, which is also a decent compressor $1200 unit. There's a lot of nay-sayers about these compressors, but if you are not going to spend $$$ on an Alkin or Coltri, the Air Charger is decent for what it is. Operation of the compressor is simple, nothing complicated, no auto purging, but it does have auto shut-off. They are really hard to come by right now.