I have no experience with air compressors. I got a Ridgid twin tank 4.5 gallon compressor in trade a few months ago. I have since fixed her up, replaced a few screws, tightened things up to reduce vibration and bought a basic air kit.
My questions is, the manual says to de-pressurize and drain water from the compressor for storage. My neighbor, "the tool guy", says to leave the pressure on indefinitely, just turn the motor off.
What do you do?