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Does the 6.4 inject fuel into the exhaust stream for emmision control? If it does, I thought that I heard somewhere that Bio doesn't like that. Hope you find a better answer from someone more knowledgeable...
What type of Bio did you run in your 6.0? I would love to be able to run W85/80 in my 6.0 but am told it's not a good idea.
in the warmer months B-50 and B-20 in the winter, I would buy B-100 from a retail pump and mix accordingly......ran it for 30k miles and only 1 gel up in the winter....I think I was running too much bio...