I run my disco & citoren zx on it have been doing for quite some time lol, newer cars like the ford tdci & pd vag engines i wouldnt advise it on though..
i use a 50/50 mix of diesel & veg oil & away you go or whilst the weathers nice an warm 75/25..... makes fuel prices abit more affordable ... specialy when my discos got something like a 90l tank an gets through diesel at an alarming rate...