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Originally Posted by Jrfish007
No in fact the only thing I said about the oil is that it should not be clear or look new after 1,000's of miles. ANY WHO KNOWS ANYTHING ABOUT OIL WILL AGREE. I think you are greatly confusing what I said, some people that believe once the oil is dark, it needs to be changed, that is NOT at all what I said. If your oil is dark it is doing it's job.
(snip).
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Going to have to go with Jrfish007 on this. As a reference, your oil is
supposed to darken (but not turn black) relatively quickly due to the suspended soot, etc. in the oil. It is that suspension and detergent that keeps sludge from gunking up the engine.
Couple of good oil articles for reference:
http://www.nordicgroup.us/oil.htm
http://www.yotarepair.com/sludge%20article.html