Time for 2nd set of injectors...
The '04 Kodiak has 105K on the odometer, and has started the dreaded LB7 white, stinky smoke at idle. It also loads up and dumps a cloud on takeoff. No obvious oil dilution or fuel knock - yet.
First set was at ~50K and the next set of 8 lasted almost exactly the same. With higher RPMs and fuel consumption, it would put the lifespan of each set at about 80-100K, compared to 2500 or 3500 series truck - if you consider the gallons fuel that has passed through, not miles traveled.
Since GM mailed me a letter extending the warranty to 200K, I am not too upset, but will require a few days off the road. I may put 20-30K on this set and start looking for the next heavy tow rig...that way the new owner would have 60-70K of warranty left, before they would be on the hook for a new set.
Everything else still works great. Overall, very happy with the truck.