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Ya, that is the same thing I've seen for the later (especially in the 2000's range!) VW TDIs using straight WVO ... works great for a while and then the engine is toast.
It probably does have a lot to do with how well the oil is treated beforehand, but now it's sounding more and more like the same amount of effort as brewing biodiesel, which (provided that's done right) the ALH series of TDI engines (which would be found in the 2001 Jetta TDI) can handle without any modifications at all.
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