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      03-07-2012, 11:15 AM   #9
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Drives: E92 M-sport
Join Date: Feb 2011
Location: Southeast

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Unless you send it off for analysis, there's really no way to determine the quality of the oil. It comes out darker than it goes in. That's generally the case with any internal combustion engine.

You might want to Google Mike Miller's "Old School Maintenance." Mike is the tech advisor for BMWCCA and their magazine "Roundel" and also "Bimmer" magazine.