I've rebuilt many HD diesels that always had been run with high degergent oil and many were absolutely spotless inside.
Add to that my 87 Chevy Suburban with a 6.2 diesel. Run on Shell Rotella for 520,000 miles before it blew to pieces. That due to a main bearing web failure. Pulled it apart an it too was absolutly spotless inside. None of the "crud" you mention anywhere. Clean oil pan bottom heads and valve covers.
Not all degergent oils are equal in detergency, and you didn't mention any specific engines or oils. I do know that the engines I've torn down that were used with Shell Rotalla or Deere TorqGard were spotless inside - even after very high hours or miles. On the other hand, engines that had been run on Quaker State HDX tended to be a little grimy inside - especially Detroits.
I never heard the "wives tale" of 12 volt ruining a 6 volt starter though. It was standard knowledge that it worked fine in any shop I ever worked at. 6 volts will certainly ruin a 12 volt starter though.
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Today's Featured Article - Talk of the Town: What's The "Stuckest" You've Ever Been? - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I was about 14 (part of the problem) when I got stuck. I was disking with a cab equipped IH 966. The window was dirty and I was driving into the evening sun. It was hard to see and it was my first pass down the field. I got the tractor so stuck that the underside of the tractor was resting on the ground. My uncle wanted
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