. . . you might want to read through this blog from a local Los Angeles gal who has run wvo in her 2001 TDi for about 40k miles. As of the 2012 date of her writing. Her failures and successes might be a good guideline for you. She is an activist and thus was running 100% WVO, which I do not suggest. She also went through several iterations of set ups. She briefly mentions a diesel van she also had converted.
The TDi can run safely on WVO but you must be more vigilant in both set up and fueling.
Running Your Car on WVO, Part 5: Risks and Rewards ‹ Tonya Kay