I need all 8. I have 2 that are bad but want to replace them all. Let me know what you have. Truck is a 2005 F-350 6.0.
I wouldn't hesitate to replace all 8 if only 2 were bad depending on the mileage of the truck. My theory is if 2 are bad how long before I loose another one or two... Also if I were going to replace the whole set I wouldn't use anything but fresh remans. I would only consider used injectors if I was tight on money and just going to replace the 2 bad ones.i wouldnt replace all 8 if i only had two bad.