Just to let you know:

I owned a 1993 amigo 4 cyl engine - used oil
I owned a 1997 rodeo 3.2L engine - used oil

The rodeo was in an accident before I bought it and had some front end damage, but I don't think that was the reason for the oil consumption.

I'm guessing that Isuzu motors are reliable IF you do ALL the required maintenance right on schedule. Otherwise, you'll be reaping the consequences of your or previous owners' negligence.