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Thanks everyone. The loose pieces are easily broken into smaller pieces. BMW recommends a pretty long OCI, so I can’t help but think this is a byproduct of that and possibly using a non approved oil. Another thought that was shared was maybe it is remnants of an oil leak stop fluid. An initial...

Best I can tell it’s the same material as the layer photographed on the wall inside the engine. Couple of photos show where the layer of material has flaked off. There were no large guide pieces in the oil pan. All of the solids are flat shaped, same thickness, and very brittle.

My 128i with 123k miles that I recently acquired shows 1 previous owner and regular maintenance history at the BMW service center. I pulled the oil filter after some rough running with a CEL and noticed the filer was collapsed a bit so I installed a new Mann filter. I cut open the old filter...