Get you a bottle of A/C oil florescent dye and a ultraviolet light you will find the leak. These are examples only you will need to determine what weight oil your compressor requires. Once repaired any future leaks are found real easy with the light.
I put this in all of my systems even when it's a brand new install.
https://www.amazon.com/Blacklight-Fl...xpY2s9dHJ1ZQ==
https://www.amazon.com/TSI-Supercool...s%2C244&sr=8-6