Ok so I know this has been answered before but im on my cellphone and its really hard to search, Im gonna be filling up today and found out we have some biodiesel stations around. So whats the difference between B5 or B20 or the other one I cant think of off the top of my head, which is better to use? Or should I stick to regular diesel? Any answers would be great. and its a shell station, so not some side of the road thing.