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Discussion Starter · #1 ·
Not worried, just curious, as my oil analysis looks GREAT other than some slightly elevated copper. But as this clearly isn't coming from the bearings (really low lead and tin), what in the heck else is in these engines that contains some copper that shows up in oil?
 

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The first oil report I got for my M3 had elevated copper levels as well, but no lead or tin. Blackstone said it could be a "brass or bronze part, such as a bushing". I don't know specifically what part of the engine that would be. I chickened out and replaced the bearings anyways. The old ones were perfectly fine. I would suggest a shorter oil change interval this time and doing another analysis to see if the copper sticks around.
 

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There are no copper parts in S62 aside from bearings shells.
 

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2009 BMW E63 M6, Sapphire Black
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old school V8's also have camshaft bearings. not sure about newer, over head cam cars. but that would be another source. those are the only bearings in an engine that I can think of.
 
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