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Step one would be to pull the oil filter and look for any small shiny metallic flakes. Using a flashlight, look closely for small flakes in the filter and housing. If you can get oil out of the filter housing, check that as well.
Good luck. Engines don't miraculously heal themselves.
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E46, E60 M5, E93 M3, F15 X5
IG - @thebimmerhaus
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