sorry to be late here,

on the denso compressors installed on these cars there is a drain bolt for the compressor crankcase, its the big bolt head right next to the electrical connector, thats where the oil is drained from. Make sure not to pour too much oil in there as it can stall the variable device in the compressor suction side and cause it not to start.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)