Just my .02 but people have been running (quite successfully) WVO in CRD diesels in the Jeep Liberty and Grand Cherokee of those years. I agree with some of the posts that heat is critical and filtering to 1 micron is a must. I have a centrifuge at my house to run my 2005 Dodge Ram 3500 as well as my ol' 1985 300D. I myself have been looking into this as my wife wants a 2006 Grand Cherokee with the CRD engine.
From what I understand it is an issue of viscosity running at the high pressures. Assuming your oil is clean, you would have to have your oil up to 200 degrees so it flows the same as diesel thru the finer injectors.