Never saw anything about that. Cummins stand was that they have seen clogged engines from running bio, I guess due to the fact that bio cleans the system real good. As far as I know the B100 I am running meets all the ASTM specs of diesel and that's enuff for me. My truck runs alot better on bio and as long as I can get it I will run it. Makes me feel good knowing I am supporting farmers and not middle easterners.