The Zexel DKS-16H takes 200ml of PAG oil in the Z32 with R134a. Testing the compressor out of the vehicle would be tricky.You could fab up some fittings and pull a vacuum on it to test the case and shaft seals, apart from that, not too much you can do except drain and replace the oil and check for debris/black death in the oil. I'd be wary of installing a used compressor that has been laying around without proper sealing plugs in the ports. A rebuilt compressor is available in the US (ACkits/Rockauto), probably cheaper in the long run when you consider that a lot of the Z32 system is NLA if you fill the condenser with black death from a junk compressor.
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