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Black engine oil? Why does your engine oil go BLACK and should change
Is Engine Oil Dark Equal to Dirty?
The Color of Your Engine Oil Says A Lot, So Pay Attention
Is Engine Oil Supposed To Be Black? A Guide to Discoloration of Engine
Does A Dark Engine Oil Means A Car Is Due For Service??? - Car Talk
Engine Oil Color Guide - MVS Ottawa
What Causes Black Motor Oil? Is it a Bad Thing?