IMO SVO/WVO is the worst thing you can do to a diesel engine designed to run on #2 diesel. Neither the injection hardware nor the engine itself is designed for a fuel that viscous (even heated it is still much thicker than #2) . On top of that, the veggie oil molecule contains components called glycerides which won't burn completely in most engines (and end up in the oil via blowby), leading to gumming, coking, and eventual failure. Here's an example:
http://forums.tdiclub.com/showthread.php?t=186108
There are plenty of other sad stories like that one. There are people who say our older IDI's will tolerate WVO/SVO. Well, they will run longer than the newer engines, but they will still eventually succumb. Just because Rudolf ran his on peanut oil doesn't automatically mean veggie oils are acceptable for all diesels. IIRC, Diesel's engine used air blast injection. Large marine "cathedral" diesels also use air blast injection to help atomize the heavy "bunker fuel" oil that they run on. That's why these engines can run on fuels that would destroy any engine designed for #2.
Anyway, I just figured I would pass on the warning. It's your engine, and your choice. I just figured I would point out that the "savings" of veggie oil don't pan out in the long run.