The maine Issue I see now with diesel is the new deisel engines are super picky. The fuel filters in diesel trucks and cars that you or I would buy are filtering down to the micron requiring very clean fuel otherwise the filters fill up quickly.
The big OTR trucks hauling your food to the grocery store don't have to meet as strict emissions requirements yet so they can operate on less clean fuel. I'm seeing the make your own biodiesel fuel deal getting harder all the time as the vehicle systems get more complex.
older Diesels your safe but the buying something new they are becoming a big headache.