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ive owned two off the dealer ship lot new pick up trucks, a 97 3500 and a 03 2500 hd. both at 100,000 miles started to eat a qt of oil by 3,000 miles on a fresh oil change. note these are not even the same gen engine. the 97 was a 350 with tbi. the 03 a 6.0.
you can also plan on starting to change every accessory on the front of the engine as they start to fail one by one.
its a gm deal, as long as its a qt or less by 3,000 miles GM SAYS ITS JUST FINE. ****** up right?