Having experience with both I would say biodiesel is the way to go. WVO is messy, time consuming, not great for the engine (if not done properly), and has had no real long term tests. Plus you must remember to switch over when the car is warmed up, switch back to purge before you arrive. The system is twice as complex and involves solenoids, heated hoses, two fuel tanks, heat exchangers...I could go on and on...

Biodiesel is easy. Fill 'er up and go.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine