BioD/WVO is so popular here that it's hard to find a reliable source of WVO. I investigated BioD production but concluded that it wasn't worth it for my low amount of driving. Commercial biodiesel is readily available here; a 20% BioD blend is about 10 cents (2% at current prices) more per gallon but better for the engine, IMO.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970