Super easy to convert back to diesel. You walk away and find another car. Done.

Veggie conversion = hard pass, even if "free." That's like dating an ex stripper with three kids - even if she still looks good and has a normal job now, I'm not allowing that kind of headache into my life. Too many horror stories for me to even consider touching such a thing.

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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap

Excellent analogy, lol!

The few WVO converted diesels VW's and MB's I looked at were in a sad state. Several trends were evident. The owners were not car enthusiasts, much less european car enthusiasts. They were free fuel enthusiasts first and foremost, and everything beyond that was neglected. I would be skeptical of any former WVO car for this reason. Personal bias perhaps, but the WVO fans I've met have all been the pot smoking "free fuel" hippie types who I wouldn't buy a shoe shine from, much less a used automobile.

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Current fleet:
1998 E300 turbodiesel
2008 E320 bluetec - leaky oil cooler seals replaced
2012 S350 bluetec
2014 GL350 bluetec

Sold:
1996 Passat TDI
1997 E300 diesel

There have been very few exceptions I’ve found. I took a chance on the one I just bought simply because it was cheap and has a MB remanufactured engine in it (1992 300SD). It’s a very solid car that’s been kept on the road, but not like I would’ve cared for it. This is Mercedes diesel #41 for me since I started in this hobby 18 years ago so I’m fairly well stocked with parts should there be any problems. Generally as a rule, I stay away from MB’s that have a WVO past. To each his own.

AMAZING......I'm a retired Naval Officer, have a Masters degree, have worked everyday of my life since I was 10 years old, and do not smoke pot. Guess you would still be skeptical of my WVO car success that I described above.
Don't worry, I'm not in the habit of selling my used cars, I either give them to family or donate them......I suppose I could round up some shoe shine if you are interested though.

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)

No comment on WVO, but your hippie analogy gave me a laugh and reminded me of Ronald Reagan's definition of a hippie as someone who:
1 Dresses like Tarzan,
2 Has hair like Jane
3 Smells like Cheetah

Take that with a grain of salt, but it came from someone who could have been Tarzan, likely dated Jane and certainly knows what Bonzo smelled like.

Cheers

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)