Quote:
Originally Posted by Cessna
Smokeywren, do you have any thoughts on this issue?
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No, sorry. I don't have any experience with a 6.0L engine.
30 years ago I owned a '79 Audi 5000S diesel. The motor oil was awfully stinking black within one mile after I changed it with a new filter. My 7.3L didn't turn really black for over 1,000 miles after a change. So I assumed that better fuel control because of the computer-controlled engine was helping in that regard.
On a 7.3L there is at least a quart of oil in the high pressure oil reservoir (HPOR) that won't drain. So when I change the oil, I'm changing only 15 of the 16+ total quarts. If that quart or so is really black oil, then I'll have over 6 percent old black oil in the crankcase within a very short time of changing the oil. So there will be some black in the new oil as soon as I crank it. I suspect the 6.0L is the same, but again, I don't claim to know anything about a 6.0L.
