I have run my diesels on well filtered and dewatered WVO that I get from Japanese restaurants since 2002. Soy oil, rice bran oil, and canola oil.
I leave my 1985 300CD in Lahaina.
I use my 1984 300D in SoCal.
I leave my 1980 300SD in Park City, UT.

None of them have any "conversions" to run the veggie oil. When the weather drops below 40*F, I use the block heater for two hours before I start the engine.

Our shop has seven other MB diesels running in SoCal without conversions either.

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You can get farther with a smile and a gun than you can with just a smile.

1984 300D
1985 300CD
1980 300SD
1993 SL500