How often does the air compressor oil change?

this problem is a bit general. The air compressor is divided into piston machine, screw machine (single screw, twin screw, oil-free machine, water lubrication) centrifuge and dicing machine.

For example, the most commonly used screw air compressor, the oil replacement cycle is generally 2000 hours or 3 months. Specific according to the different oil and the use of different environment, air compressor oil replacement cycle is not the same.