Can't speak to a Duramax but I have 217,000 miles on the original turbo in my Powerstroke (knock on wood) and I cool down. As was suggested, I added a pyrometer and use it to help manage my driving. If I see the temp getting around 1200 while pulling a hill, I back out of the throttle AND I always try to remember to cool it down to 300 before I shut off the engine. It's working.
Virgil & Jo Allmond
1998 Volvo 610, 425hp, 14 Speed tranny
STICK HOUSE IS IN Suches, GA
TODAY WE ARE IN A 3555RL IN Whitehorse, YT, Canada
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