The truck is in for 8 more injectors (2nd set). Dealer called and said my lines are rusty and need to be cleaned and maybe replaced. I have run dual filters and additives since the start. I use clean Cali fuel and Im wondering how they can be so bad? I have 122k on the truck now.

They also said the loud knocking I hear in the morning is the valves needing to be adjusted. They want 190 to adjust both sides while replacing the injectors.

This sound OK to the techs among you?

All i can tell you is I replaced mine As they were rusted I was shocked that they were like that being inside the covers getting soaked with oil But what was rusted was the flared fittings that the fuel ran through at the connections.
I'd replace as your in there already But they arn't cheap about 350 if i recall