"unless you own the 5 cylinder Mercedes engine. Then, no modifications are needed". Looks like I'll be fine with that.
Bio can also heat my house as we burn oil in our boiler."


You can run a blend in MB right now. No need for bio-D

As for the house, the guys over on altfuelfurnace are getting close to modifing a Becket to burn WVO.

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1999 E300DT (131,800) 154,000 Black on Black SOLD

2006 CLK 500 coupe Capri Blue on Grey (zoom,zoom)
47,000mi

04 VW TDI Passat 80,000mi
(Techno)

How to eliminate oil dependency through market-driven approaches.
“We could cut oil use in half by 2025, and by 2040, oil use could be zero,”
The Sound of Diesel Speed
Ode to MB