the dealer just saying the bearing was bad, and that was the cause is B.S.! the bearing failed because there is something else wrong. if it was because the bearing is bad then the other five bearings would have failed too.and the fact that it is #1 99% rules out bad bearings.you would also think weak oil pump? but from what i saw on the cd manual the oil pump is in the front ,which would mean the front bearings are oiled first.could be a lean cylinder causing detonation ,causing the bearing to be pounded to death? and another question is why are some failing and not others?i think isuzu has the answers.maybe andy from isuzu can shed some light.one last question is are the short blocks updated ,and if they are what is updated? shawn