You can test your system to see how much oil in present see our post here
You can find the specs for your car and it will tell you the amount of refrigerant needed and the amount of oil needed.
If you recover the refrigerant from the system and change a component within the system then you need to add oil here is a rough guide to amounts of oil needed.
Major system leak ( empty gas ) 1.5 fluid oz
Minor system leak ( pressure switch shut off compressor ) 0.5 oz
Accumulator 1.5 oz
Condenser 1 oz
Evaporator 1 oz
Receiver drier 0.5 oz
Hoses 0.5 oz
compressor measure the amount of oil internal to compressor and replace this into system in new compressor ( typical 2 oz )
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