95 A6q AC oil replenishing question

[TooManyAudis at aol.com]

Hey Guys,
 
I replaced a leaking AC line (compressor to receiver dryer) and the  Receiver 
Drier on my 95 A6q.  How much PAG oil do I need to add back into  the system 
to make up for the oil lost in the parts replacement?
 
Thanks,
 
tom



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