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I'm not so sure those larger chips on the oil filter bottom are aluminium. Could just as well be steel or molten bearingsurface (I don't think it's lead anymore, but maybe tin or bismuth or something like that)
A magnet will show if it's steel, and if you can hold the larger chunks with a tweezer you could check with a lighter if it melts really fast. Aluminium also melts relatively fast, but bearing surface material just shrivels up immedately (such a small piece anyways).
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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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