i am just now starting to deal with the same issue as stonebreaker described, with my '06 cummins 5.9. i have been running blend for the last year (10,000 miles) since i bought it used & the truck had not run on any biodiesel prior to my purchase. my issue is a progressive decreasing of turbo...

Noticably absent from either the New Holland or Case IH lineup a biodiesel approved engines is any Cummins engines. Both tractor manufacturers have Cummins engines in some of their models. It looks like most of the B100 approved engines are European or Japanese. Sad day for us.