Very good advise. Something else to consider is the oil. I recently had to replace the pump on my compressor. Had I done regular maintenance, it would have likely lasted more than the 17 years it did. The new pump that I got came with very little information. It was made quite clear about one thing though. They do not use engine oil!
If the compressor is in the shop where you are doing grinding or body work, check the filter alot. Figure that the dust that you are creating, the compressor has to breathe.
Blowing out the electric motor is also important. When doing that, make sure to blow out the area where the capacitor is also. The dust will build up and cause them to short out. Been there, done that also!