I assume you can purchase it also however will biodisel cause an issue for ecodiesel engine made by fiat? Has someone tried it on eco?? Cummins we know people run it and have no issue and yes the lube is much better than regulad diesel or hydrodiesel.Its mandatory in MN Retail Nov 1 to April 30 3% Bio , May 1 to Oct 31 20% Bio ,Retail Biodiesel is the best lube fuel You can purchase, HPCR do NOT like Home Brewed Bio. If your going to brew It yourself, You will need to be very careful in whatever process you use.