I'm going to say yes, a non-commonrail diesel is going to do a lot better on WVO than a commonrail, if only for the fact that non-commonrail diesels have a little more tolerance to higher viscosity fuel (and probably some more particles too), especially if you can find one with a Bosch VE pump. (Stay away from Lucas/Rotodiesel garbage)
But getting a good van for cheap might be a challenge, and getting a good price for your current van too, unless you manage to fix the engine by running it on normal diesel for a while..
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