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Judging from the stains on the bottom reinforcement plate the leak is on the other side.
Maybe the OFHG?
Could also be the VCG (although leakage usually starts on the other side), or an oil pressure sensor ring.
Hard to tell really based on these pictures. Start cleaning your engine, drive for a while and look for small drops.
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Z4 3.0i | ESS TS2+ supercharger | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | Powerflex/strongflex PU bushings | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers/KW camber plates | Sachs race engineering clutch | tons of custom sh#t
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