Handling Lubricating Oil
Avoid breathing lubricant mist; it can cause irritation to the respiratory system.
Always use fresh oil from a sealed container and do not leave oil exposed to the atmosphere for any reason other than to fill or empty a system. PAG oil is very hygroscopic (absorbs water) and will rapidly become contaminated by atmospheric moisture.
PAG oil is NOT compatible with previously used mineral based oils and must NEVER be mixed. Do not re-use oil when it has been separated from refrigerant, following a recovery cycle. Dispose of used oil safely.