nope, but I wish :)
you can use it for house heating.
in general the quality of cars is decreasing, and I doubt that now are used more robust components. I believe in opposite and the reality confirms it. Old cars have no problems even with used oil from mcdonalds...
so you think that manufacturers are worried to reccomend biodiesel because of oil companies? :)
And they are not worried to constantly work on decreasing the consuption with more efficient engines, aerodynamics, downsizing, start-stop systems, hybrids, energy tires...?
I think that car manufacturers do not test their wehicles on biodiesel, furthemore the quality of biodiesel may by varying and the sensitivity on fuel quality of new turbodiesel engines is fact, it is the reality, not just words from somebody.
I am not surprised that car manufacturers do not reccomend it.
I am surprised that you have bought car for 40 grand and now you want to save every penny with high risk. Even with high quality diesel has IS220d quite lof of problems with reliability, with price tags of new parts: EGR app 350 eur, turbo 2500 eur, DNPR 2000 eur, injector I guess about 400 eur.
If you want to drive economically, buy old jetta 1.9d or something similar and you will have no troubles with veg oil...