Duramax was tested under hard use and given a "B10" rating of 220,000 miles. It was not B50 tested. That means 10% failed by 220,000 miles and 90% made it that far with no major repairs.
For comparison, here are some "B" ratings on other engines.
Ford (Navistar)Max-force 7- 6.4 liter. B10 262,500 miles (6,730 engine hours). B50 - 375,000 miles (9,600 engine hours).
Cummins 5.9 diesel has a B10 rating of 210-250,000 miles (6,400 engine hours) and a B50 of 350,000 miles (9000 engine hours).
Isuzu 6H diesel - B10 durability rating of 410,000 miles (10,000 engine hours)
International DT466E has a B10 of 300,000 miles (5200 engine hours), and B50 of 450,000 miles (11,500 engine hours).
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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