I lost my previous '99 VX due to mystery oil loss. Ended up throwing a rod. Was replaced under extended warranty, then traded it in and bought a '01.

After having the shortblock replaced I had a lengthy discussion with the isuzu tech that redid my engine. He talked about not enough oil getting to certain cylinders due to some type of channel not being wide enough, or something to that effect. This being a problem with the 3.5L engine in general. If it's true, who knows.

I should've taken it in sooner to have looked at, because it was lower on oil before changes then it should have been (imho). But yet, no leaks - nothing.

Not making the same mistake twice. I'm seeing the same as the rest here. Right before one change, the stick showed the oil at ADD. This was after roughly 4,300 miles since last change.

I have an open ticket with the Isuzu dealer currently, great buncha guys there. They have me bring my car in every 1,000 miles and they do the diagnostics and record oil levels. Time before last I was a quart lower then I should have been. But just last time the oil usage was rated as "perfect".

It hasn't been regular enough to really merit any action one way or another thus far, though the service manager tells me next round if it's at a loss again they'll pull it apart and see what they can replace.