Whether its I have bad luck with vehicles, or if Alaska is just really hard on cars and trucks. Or, if American vehicles are just as shoddily made as their reputation. 3 of my 4 cars have had major engine failures, resulting in engine swaps or serious overhauls being necessary. My old Chevy that my brother has been driving just seized up yesterday..
So far, the only car I've owned still on its all-original motor is (ironically) my $100 Tempo.
I've heard of late model Chevy's having oil pump problems, and I know the majority of LB7 Duramaxes ran around 20psi after break in. Seems GM's problem is a lack of oil pump prime on startup. I think if I owned one, I would put a pre-oiler on it and run it before each start.
It was a couple years ago when I first started a cold Chevrolet truck, and when I discussed the sound I heard with the owner, he said it was normal.
I'm sorry, rod clatter on startup should not be normal for a new truck.