Originally Posted By: GaerteRodeck
One oil sump holds approximately 1 1/2 qts. Compressor does not get continuous use.
Only if the Owners Manual lists a non-detergent oil, you can safely use such n oil type.
Otherwise, specially since you do not have continuous use, it is generally better to use a suitable ISO grade detergent-type oil.
This will take care of keeping the deposits dissolved in the oil for longest time periods.
If using a non-detergent oil, make sure you monitor the oil more frequently for cleanliness and change it as soon as it shows any signs of dirt in the oil.