I looked up your model AC unit on the Daikin website and found that it is fitted with a hermetically sealed compressor. This is the same type of compressor fitted on domestic refrigerators, only slightly larger in size and capacity. This type of compressor requires no maintenance for its entire intended life-cycle, not even checking oil level, let alone adding any. This is exactly why the manufacturer does not mention anything about oil except the type used in case of major malfunction. I am curious as to how you determined that the compressor requires adding oil in the first place. As far as I know, the only way this type of packaged system can lose any of its oil is through a leak in the tubing. If this is the case then you no longer have any refrigerant in your system and you have two options. If the unit was not damaged during transit or installation contact your vendor for an exchange under warranty, otherwise you will need for a qualified technician to purge the system of air, find and fix the leak and then add oil and refrigerant.