I have a 2007 2500HD DURAMAX / ALLISON 4X4 EXT CAB with BANKS BIG HOSS BUNDLE I called two different dealers an asked if I could run Bio Diesel in my LBZ motor. One said NO, Another said yes; 5 % only. I called a BIODIESEL BREWER and he said sure B100. So what am I to believe? Is there any one out there who has any first hand experience with Bio-Diesel in an LBZ motor?