Standard service instructions from Quality Refrigeration emphasize the following lubrication requirements:
Requires roughly 28.8 liters (approx. 61 pints) of oil.
Only trained personnel should perform maintenance due to high system pressures. Always ensure the before servicing, and use only nitrogen or inert gas for pressure testing—never oxygen. Carrier 5H120 Manuals, Procedures & Parts List - MaintainX
The oil filter cartridge must be replaced after the first 100 hours of operation.