I have not heard or "smelled" bio diesel for a long time. There were several places around here you could go and get it from. But haven't seen them sell it for years.
My workmate used to fill his 80 series with it.
It was fish 'n chips day, everyday driving home behind him. The poor old "unbreakable" 1HZ didn't like it. Probably the only 1HZ that needed a rebuild, but he claims it was not the bio diesel being the issue. The rest of us know it was.
The way the motor ran and sounded, it was not good.
There is a farm bloke up Alexandra way running 2 large Cat powered generators and he claims they've ran flawlessly with bio diesel for many years. He swears by it!! He also blends in "used" engine oil with it, from the very same motors after a service.