So are you saying if you have water in your fuel system from a bad fuel source and it fouls a injector GM will replace no questions ask even though it's not a manufacture default. To me that would be between you,or insurance company, and fuel supplier to work out a solution for the fix. That's why I always get a receipt every fuel purchase. Or maybe I don't understand your statement.
Also I had #2 injector replaced on my 03, cause was leaking injector per worksheet invoice and did have to make three trips before they finally heard the intermediate low rpm knock,but once they pin-pointed the culprit there was no hassle about re-placement injector.
Tony