The main issue as I see it is Isuzu is a truck company that makes truck engines. Truck engines are not built with as tight specs as car engines (on purpose) in order to handle the harsher demands placed on them. This allows for more heat and cold temperature differentials. This also causes more oil consumption. Most of the engine issues have been caused by lack of oil due to owners disregard of checking the oil. Given the VX original cost most buyers were probably of the mind to drive and go with out proper attention to oil level thus causing the engine failures. It would have helped if Isuzu had provided a warning for more frequent oil check when they put 15,000 miles in the owners manual possibly causing owners to disregard oil checks even more.