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My dealership offers both sythetic and traditional oil and tells me since I pretty much stick with 3,000 mile changes there would be no need to go to synthetic oil. The tranny is the one I am more concerned with, I am running the standard tranny fluid it comes from the factory with. This is my 2nd Duramax as well, first one (2003) had 24,000 miles on it before it was a total loss after an accident in a blizzard. I run synthetic in both the front and rear diffs and am planning on having them switch the tranny as well. The truck gets all the recommended services and fluid changes at each mileage suggestion from GM. I really want to run this well past 150,000 miles.
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