running good quality made BD should not cause you any trouble. My father-in-law run B100 in a 06 6.0L and has had no problems..about your warranty Ford will allow up to B5 anything over that and the risk is yours to take, however ford must show that the failure was directly caused by the Biodiesel in order to void you out. if the rearend breaks it should be covered, if an injector goes then get out your wallet
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