Personaly I would not touch them as long as its running ok until the truck is already in the garage for something else. More or less to eleminate another day of down time. Start saving for them now. This way its a "planned preventitive repair"
I just replaced mine and only 2 were bad but we did all 6 at the same time. Truck has 649,900 mile on it. They were the original injectors. This was on a Cummins Engine
Shadow, I am curious, how much did you pay for 6? and were the rebuilt or new?
If you don't mind me asking.
Whats the symptoms when they are gone? Should I buy 6 and keep them in the truck?Thanks