Hello, I would like to ask whether the warranty claim can be asserted in the case of the engine damage caused by the spongy fuel if unintentionally there is. This may be the case, for example, that one makes a long journey to Ural with one’s own car and on the way black sheep is caught at the petrol stations and is fed with false fuel. And if there is no official warranty claim, how can the seller (dealer) prove that the caused engine I can only imagine that all this can only be verified by a laboratory expert, which is very complex. I also imagine that the vehicle will always be refuelled with biodiesel until the engine gives up its mind.