few people seem to have the wrong idea about biodiesel. while it is produced from vegetable oil, the end result is quite different. goes through the process of trans-estrification i believe it is, and the end result is a much thinner liguid than the orignial oil. my sources have all said that bio-diesel is in fact a very good solvent. many people who switch initially find themselves with blocked fuel-lines because the collected crud in the fual-lines gets washed out and blocks parts of the line. while this is bad in the short-term, it is very good in the long term as all the fuel components including the injector pump will be a lot cleaner. no carbon build-ups within chambers either.
i would agree with docmartin, in that you would be wise staying away from computerised injection systems as the different fuel may screw up all the sensors causing the engine to have a bit of a fit.
the best site i have found is
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details all that is needed to now about bio-diesel, and the other option you could take which is a dual-fual system running off raw vegetable oil, however i believe this is really only an option for old, large capacity, "traditional" diesels.
yeah, i know almost everyone in australia, so i probably will meet up with you sometime Tim. reccomendations for offroading?? just drive and see where you end up. you'll no doubt find somewhere very nice.
cheers fellas.