see the only place i found it was a station up in santa barbara , ive been recently goin up to big bear to get as much snowboarding i can before season ends by now its not that cold high 30's im sure if i dump a bottle of that diesel kleen cetane booster it says it works great with biodiesel , but the thing is in my manual on the 6.4 says no more then B5 bio diesel hahah finding a place like that is a joke most are like b20 or higher , i hear my fuel filters are little more restrictive then ones on the 6.0 ehhh i want to take the chance go fill up a couple 50 gal drums and bring em home but wondering if my warranty would go to crap , fuel fitlers be like 75 bucks never changed them before but i kno they are required to be change pretty often in running bio D im shure its not hard to do . what you think half tank of diesel and half bio that should drop the numbers of the bio yea ?