I failed to change and maintain the oil. Now, I can find the right oil and refill it, and see if it still works, after making strange noises, and my finding it nearly dry. The lable on the tank calls for 20-20W SF-grade oil, but the local NAPA store has none so labeled. Should I use the oil that they do have that is called Air Compressor oil, that has no weight or grade information? (The model number shown on my original post has no relationship to my compressor.)