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[philhyde]

Just came across this thread, I and hope no body minds me resurrecting it.

My 6.0 just came out of the shop after a new FICM, 2 injectors, and new HFCM. Initial problem was rough running/missing.

History is that I started running B50 in this vehicle about 2 months ago. Filters were changed about 1 month ago and then the vehicle was driven 3000 miles towing a 4000lb trailer. Along the way in Illinois I picked up some pump bio (B5 or B10?) but the rest was all D2. A couple of weeks ago, I filled up a mostly empty tank with B100. I'd guess the tank was B90 or better. Toward the end of that tank is when the problem started.

I have a long history of running bio in VW TDI's, and I guess they are much more forgiving. I am having a hard time believing that the bio killed my 6.0L, but it looks like a clogged filter is the likely culprit. Diagnosis from the dealer is that the HFCM dying is what took out the injectors. They didn't say anything about dirty/questionable fuel. They said the fuel was clean. So I guess I'm kind of hoping that I had a bad HFCM and that is that.

But I can't help but think that my inexperience with this engine contributed to the situation. If I had recognized how sensitive these engines are, I would have been more diligent about changing the filters.

You can bet from on that I will change them frequently!