Hi JJ
I used to change a lot of new R22 Maneurop compressors to POE oil . Get the Maneurop POE oil then you know its the right grade. You will need 4 litres per machine for the MT125.
If you haven't already started to use R422D then do as Joe has pointed out , ie use R407F refrigerant. It can replace R22 , you will need the POE oil and you can now get R407F expansion valves. I know Danfoss do them and I suspect other manufacturers do also.
With these blended refrigerants it is always best to replace the O rings seals if possible, as with R22 O rings can expand to up to 50% larger in diameter but with the new gases O rings only expand a few % and can therefore leak, so during service always fit new seals.
R407F has a higher discharge temperature so make sure the suction superheat is set down to a reasonable level to keep the discharge Temp under control GIRFT (Get It Right First Time ) Good Luck