Ya, its great if you have the means to do it yourself, but sourcing all the components can take a lil while. There are different formulas of bio-diesel too. My cousin was able to find one that didnt require any fuel system conversion. He filled up at a local gas station one day, drove the truck as he normally would until it came time to refuel, and filled up with his own brew. He has successfuly run it in 5 of his own DD's that I know of, maybe more, and the worst problem he had was a fuel filter needing changed after he switched to his home brew. In reality tho, that was a 95 or 96 Dodge truck that may or may not have ever had the filter changed, so it may or may not have been related to the bio-diesel.