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New to the forum. Just changed all 6 injector as they all had excesive return and throwing a P0191 code. Truck has 228,500 to be exact. Started seeing the code pop up around 150k. The holes in the nozzle are covered in soot and can't be seen. I have used Diesel Kleen once or twice a month for a long time. Truck is primarily used on the hwy and has seen some longer than usual idle times (1-2hrs). Not sure what can prevent the soot build up over time however I think its inevitable no matter what you use as an injector cleaner. Just some info for everyone.
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