I use 5w30 mobile 1 synthetic. Some are using 0w30 to help get rid of lifter ticking noises, others go as high as 20w50 to help with oil burning issues. So I dont think there is any set standard, just depends on what is wrong that you are correcting. I will say that 5w30 is probably the most common and what isuzu recommends.
1999 Rodeo LS 3.2 4x4 5 Speed
32x11.50-15 BFG T/A KO
3\" Lift - Rancho 9000x
Rear no-slip locker
There is a very fine line between \"hobby\" and \"mental illness.\" Dave