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I can't see very well as the quality doesn't come up great mobile, but have you been using the right grade of oil?
With sludge build up like that it's probably quite likely an oil gallery has blocked up causing oil starvation somewhere
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Current: 2009 E90 325i M Sport Auto
Previous: 2017 435d xDrive Gran Coupe, 2010 E90 318d SE, 2009 E90 318i SE.
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