No, finish the 3,000 mile interval, then run a mild engine flush and switch to Rotella. As a minor correction, as far as I know, the original pistons had two holes, the revised pistons had four holes. The way you can tell which you have is to look at the PCV valve. If it is a push is valve you have the old design, if it is a screw in valve you have the revised design. The oil you are looking for is the Shell Rotella 5w-40 synthetic.
If it is true that "Isuzu spent more money developing that 4wd system then most companies spent to develop a complete new SUV" I would say that was a colossal waste of money.