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MacCool · 10-31-2014, 09:06 PM

Oil goes black from soot...normal byproduct of combustion. Modern oils have better detergents than a decade ago. The black oil is the detergent doing its job. Black oil does not necessarily mean that the oil needs to be changed.

10-31-2014, 09:06 PM	#9 (permalink)
MacCool A True Z Fanatic Join Date: Apr 2011 Location: Midwest Posts: 1,349 Drives: 370Z PW 2014 Rep Power: 16	Oil goes black from soot...normal byproduct of combustion. Modern oils have better detergents than a decade ago. The black oil is the detergent doing its job. Black oil does not necessarily mean that the oil needs to be changed.