I've owned a '81 Mercedes 240D for 28 years and a '90 F-250 7.3 idi for 20 years so I'm concerned about what we're being forced to use. I'm told by a trusted source that the bio mix tends to dissolve years of gunk and could clog fuel filters.
According to my research California has 13 operational refineries. 10 of those produce CARB diesel which is dyed green.. I don't know about the off-road stuff like the farmers use but it's probably all the same.