Got my truck back yesterday from the dealer. Replaced all 8 injectors. Lucky me, it was covered under the extended warranty. I strongly suggest that you change your oil as soon as possible after getting your injectors changed. I changed my oil last night and noticed alot of grit and small particles of sand in my filter. I have a pure power filter that is servicable. When I pulled the oil filter apart all the grit was between the can and the filter with no noticable grit on the inside of the filter that returns oil to the engine. Truck runs smoother after new injectors. Hope these last at least 72,000 miles.