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bestatchess said:
I use the same stuff, drain it at 7,000 and it is black, although this is essentially irrelevant. If you want to know how it is holding up, send a sample to Blackstone labs and get an analysis.

http://www.blackstone-labs.com/standard_analysis.html

Like bestachess said. color has nothing to do with the quality of engine oil. M1 does a great job at cleaning cylinders. It's black because it's cleaning all the crap off the pistons and stuff. The oil keeps the particles suspended and makes the oil dark. If my oil looked clean after 9k I would be worried that it had no detergent value and didn't do any cleaning.
 
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