I changed the oil in the air compressor today. I am using Mobil 1 per the recommendation of the manufacturer. The compressor uses 6 oz. of oil so a single quart should last me 5 changes, or 15 months. assuming I remember to change it every 4 months.

To be realistic, I will probably only change it about every six months, but that should be ok because I am not using it 40 hours a week.