Hello together, first of all: It is a question of fuel, but since it is not an alternative (bio, ethanol) the corresponding forum would have been the wrong one. However, since my question is at least aimed at safety a bit far, I post it here. If there is still a better area, then just let me know, and I move there. The consideration arose out of an official invoice check. Here I noticed that some vehicles e sometimes be/were refueled with this “super-sprit” (according to advertising). However, it is “traditional everyday vehicles” = service car alá Audi A4/A6, BMW 320d, VW Passat TDI, … Asks me the question: Does that have to be? After all, the fuel costs a lot more. Whether this really brings a saving as propagated according to advertising, interests me rather less and should not actually be the subject of the discussion. Question is: Are there modern (standard) vehicles, which must refuel this fuel? Thank you and greeting Martin