Quote Originally Posted by Tobert
I'm actually gonna try Chevron Delo 15w40 next change after reading a bunch of stuff and this thread about Shell Rotella 15w40 fixing the Isuzu 3.5L oil consumption problem for somebody:
http://forum.planetisuzoo.com/viewtopic.php?t=7033
I would personally shy away from using anything too different from the 5w-30 recommended by Isuzu. Oil consumption is indicative of a bigger problem such as worn rings or a leaking gasket. I think maybe a heavier weight oil masks the symptoms for a while, but it doesn't actually correct the source of the problem.