Yep. 1) Clean your EGR & PCV systems to reduce cylinder temperature & crankcase pressure, 2) try a few overnight cylinder soaks with a cleaner type product (seafoam, marvelsMO, etc...) to clean the piston ring packs & oil drain-back ports. 3) always run a quality oil & never stretch an oil change interval past 3Kmi on this engine
, run the highest viscosity your climate allows per your owners manual.
As a band-aid fix, you can run a HEAVY oil to reduce consumption. Isuzu specs that a 20w-50 oil can be used in temps above 10degF
.
G/luck
Joel