Volkswagen Passat 1995 Official Factory Repair Manual page 4211

A/C refrigerant system, capacities
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Refrigerant (PAG) oil R-134a,
distribution
The total refrigerant oil quantity is distributed in
the refrigerant circuit as follows:
Compressor approx. 50%
Condensor approx. 10%
Suction pipe approx. 10%
Discharge pipe --
Evaporator approx. 20%
Receiver drier approx. 10%
Note:
When replacing refrigerant circuit components,
fill an appropriate amount of refrigerant oil (as
indicated above) into the new part before
installation.
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12/7/2004