That sounds good mate and I've heard few doing it! Maybe your friend did it but I've to accept that I did not try this method. I definitely did not want to run into problems or possible explosion . I advice you to stay away from this method unless you let your friend experiment on your bike. Whatever diesel is left inside the engine would mix up with oil and I don't know, this just confuses me. Sorry! We are just trying to tidy up the internals with some special additive and diesel seems extreme to me.