My buddy with a Duramax had to replace all his injectors at 120,000 miles and got me worried - I have about 200,000 miles on my 2006 Dodge. How long do injectors typically last and how does it diff...
I'll assume his Duramax was an LB7 made form 2001 to 2004.5. The eighth VIN digit will be a 1. These had lots of injector problems. GM eventually issued an extended warranty on the injectors. I wouldn't relate his failure to your completely different engine.