Shorthand estimate on amount of POE oil for ACCU on start-up

Hi Guys,

Is there a shorthand way in calculating (or estimating) the needed amount or POE oil for the ACCUs?. Considering that the units are new and just recently installed (independent system for air conditioning of mixed system on an industrial building).

Is there a correlation to the amount of refrigerant to the needed oil? for example, 1000kg of 410A - how much Polyolyster oil?

Thanks