How often do you drain your air compressor?
I bought a brand new compressor for my shop 25 years ago and it came with an automatic drain valve. I used that compressor the whole time I had the shop and then sold it for almost what I paid for it. The compressor looked brand new and still ran great. The automatic drain valve was one reason the compressor lasted so long. Other reason was that I changed the oil and the air filter every year. It also helped that my compressor was inside a heated building so it never sucked in cold air or got damp.
I bought a brand new compressor for my shop 25 years ago and it came with an automatic drain valve. I used that compressor the whole time I had the shop and then sold it for almost what I paid for it. The compressor looked brand new and still ran great. The automatic drain valve was one reason the compressor lasted so long. Other reason was that I changed the oil and the air filter every year. It also helped that my compressor was inside a heated building so it never sucked in cold air or got damp.