Excellent work and progress! I have a small request/question if you don't mind: Did you pull out the oil filter housing that's attached to the oil pump by any chance? There is a spring valve in there that for some of us has fallen out during oil change and has created quite a debate on the nessesity of it. I posted a pic of mine in one of my threads (pressure relief valve falls out during oil change (or something like that)). You have already confirmed it's not in the oil pump which is good news.

BMW X5 4.8iS 2005

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers