‘03 Duramax.
Injectors twice ... once at 114K-ish, covered by dealer for $500, and once at 170K done by yours truly for $1600 in (upgraded) parts and a long weekend-plus of labor.
Front end upgraded as stock parts wore out, Pittman, idler, tie rods, upper controls, bushings, ball joints ...
Approaching 220K now and runs like a raped ape ... no plans to buy new here at current prices and with current DEF/EGR crap.
All in all, great hunting truck that’s seen hard use and continues to roll. No regrets. Knowing what I know almost 18 years after I took delivery, would do it again, no question.