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2004 E46 330d M57N metal particles in oil filter


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Purchased my vehicle at the beginning of May with 186,000 miles. Recently conducted a comprehensive service at 190,000 miles and discovered microscopic flakes of gold-colored metal, around 1mm in size, in the oil filter. I am awaiting the arrival of an oil analysis. Is this likely related to rod bearings? What actions should I undertake? What is the severity of the situation?

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A faint whining noise varies with engine RPM, but I am very certain it originates from the belt and is thus unlikely to be connected. Upon opening the oil cap, a peculiar tapping sound is emitted; nevertheless, this phenomenon is reportedly typical for the engine, leaving me uncertain. It operates well, as it has for the 4,000 miles of my ownership, and there are no strange noises emanating from the lower end. I am supposing it is the rod bearings, however.

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I concur; I anticipated that the high mileage would need repairs, maybe extensive ones. However, I am prepared to do this since it is a unique vehicle. I will inspect the filter tomorrow and await the oil test results. Subsequently, I may replace the bearings during the next 1,000 to 2,000 miles throughout the summer.

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